Great list to start.As new guy to the hobby, I will jump in first.
1) shop location ?
2) power available ?
3)Access to shop, ie Doors?,basement?, stairs?, etc.
4)Can you move the machines yourself or will you need help ?
5) What kind of work size will you be doing ?
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My current wood shop is in a Garage with one full bay for all my equipment (so I will need to arrange things to fit).
Power in the shop is currently 120c single phase, but the mains in on the wall in that bay so I was planning on adding 240v 1 phase outlet.
Access to shop, Garage door and entrance to home easily accessable.
I will probabaly need to move the machines by myself (was planning on getting a HF 2ton hoist to help, but I might have help.
Size work, much of the stuff could fit on a mini mill/lathe but I desire very high precision for most of the projects, however I would also like to handle larger pieces like gun barrels too. I KNOW that most of precision comes from technique, but I can learn that, but I prefer to not fight the equipment to get there.