Shamus:
Welcome to our forum and greetings from the Catskill Mountains of NY State, USA. You have the makings of a basic home machine shop with what you've accumulated. A couple of thoughts:
-re: "making a quill" for your AEW Viceroy milling machine: A common adaptation here in the USA is to add a Bridgeport or 'Bridgeport clone' milling head to a horizontal mill. In many machine shops, horizontal milling machines (particularly the older flat belt driven machines) would fall into dis-use. However, these machines have the makings of a very rigid machine vertical mill. Adapters to mount a Bridgeport type milling head on the overarm (arbor support) are shop made, and the old horizontal mill gets a new lease on life and lots more use. If you can find a used machine tool dealer, industrial surplus shop, or perhaps even a scrapyard find of a vertical head, you can save yourself a lot of work. Making a head from scratch with a moveable quill, rack feed for the quill, and boring the head so the quill is a good fit, is a project in itself. Just making the body of the head is a job (either make patterns and core boxes for a casting, or use welded steel construction). 3D printing won;t get it and hold together for too long in any real working conditions.
Without getting into the finer points of it, making a milling/drilling head with a moveable quill from scratch is a job requiring quite a bit of experience and skill, and having access to a milling machine with boring head, engine lathe (centre lathe) with enough capacity to turn and bore the quill, boring the counterbores for bearings, a milling machine with dividing head and foot stock to mill the splines on the spindle.... lathe to bore the internal taper in the spindle.... and on it goes.
Hunting up a used milling head from another machine tool and making an adapter to mount it is the way to go in my experience.
-re: cost of a manual: Tony Griffiths has provided all of us and the world at large with an incredible site and reference. He does not charge to access his site, and puts an incredible amount of work into maintaining it and updating it. While the cost of reprint of a manual for a machine tool may seem high, consider the work and service Tony Griffiths provides. The rest of the story is that you are working on machine tools that would normally be found in working shops where the cost of a manual reprint would be considered as part of "the cost of doing business". If you got the surface grinder for 100 pounds and it is complete, think in terms of what it might have cost you if some critical parts were missing. Suppose you discovered the grinder were missing its magnetic chuck or perhaps a helical gear, or some other part vital to using it ? You'd be shelling out money to buy parts or paying an engineering works to make what you could not make yourself. You got a complete heavily built surface grinder for 100 pounds, appearing complete. There is an old saying in the USA: "If you wanna play, you gotta pay".
The rest of the story is that when we work on older machine tools, quite often there is no manual. This is where 'reverse engineering' comes into play. Namely, if a part is missing, we measure the mating parts and distances and design the replacement part. It may mean doing 'gear math', and it may mean using welded steel
construction vs an original casting. When no wiring diagrams exist, we get the 'multi meter' and some 'wire markers' (if the wires are un marked) and we 'ring out'
the wires and draw a wiring diagram, figuring out the wiring.
By way of example: just last week, a local machine shop where my nephew is apprenticed called me up. They have about an 18" swing LeBlond Regal lathe that suddenly started tripping the circuit breaker every time the control lever was moved to switch on the motor. They had paperwork and manuals from the time they bought the lathe new from LeBlond in the 1960's. With it all there was NO wiring diagram. My bro and I got into it and in about 15 minutes, identified the problem as a phase-to-phase short circuit in the stator windings of the motor. It's like playing detective or tracking game in the woods, you start with the simplest things first and work from there. Of course, we made sure, first thing, to put our padlock on the disconnect switch for the power to the lathe, locking the switch in the 'open' position. A few minutes work with a multimeter and then a meg-ohm meter ("Megger") to confirm what the pocket-sized multimeter told us and we had the diagnosis. We identified the power supply wiring to the reversing switch, identified the switch terminals for the power to the motor and made sure the short was not in the switch, then checked the wiring between the reversing switch and the motor for faults (none found), and then moved to the motor itself. It's a matter of thinking clearly,
using an orderly process, and starting with the simplest things first. Most machinery or vehicles will have clues as to how things go together and come apart, and also have clues as to how things are working/wearing. A manual is handy, but even if you had one, it is not uncommon for a machine tool manual to be 'generic' and skip
things like electrical wiring as different users may run different control schemes, different voltages, etc.
The motor on that LeBlond lathe (a "Servo Shift" headstock model) was oil soaked from a leak in the Servoshift hydraulics. It is an open-frame motor and aside from the oil bath, had plenty of metal chips in the air vent slots in the stator housing. The lathe had seen about 50 years of use in more of a toolroom type setting, so not too improbable for the hydraulics to piss oil and chips to wind up in the windings. The motor will be sent to a service shop, and depending on price, may well be replaced with a new motor. That machine shop covers 50,000 square feet of floor space, plenty of work, and having the LeBlond lathe down is not something they can afford to let slide. While there is no immediate work for that lathe, they do not want to be caught with it out of action should a job come in for it. We do fine without a specific manual, and this is what is often the case when you go to service or repair machine tools, particularly old ones. Again, my hat is off to Tony Griffiths, and while the cost of the manual may seem high, consider the service Tony Griffiths provides. Without him, you might well have no access to a reprint manual, and no access to ready reference as to the history and design characteristics of more manufacturers and machine tools than we can count.