Having worked in a full garage and having a lot of stuff in my own house garage, here's what I'd suggest from a been there..seen it..common sense perspective.
Each station:
Lifts and maybe a pit
Rolling carts with the basics: hammer, two of each screwdriver (one med, one small), adjustable wrench, metric.standard wrench set (ratchting if budget allows), deep six point socket sets 10-19mm and standard of same basic sizings. Trans line/fuel line disconnect tool. Trim clip tool, gasket scraper, radiator hose clamp tool. Corded lights (preferably flourescent/led), pliers, cutters, knife
Outlets: 4-8 outlets per station. No one ever needs that many, won't hurt.
Workbench with vise
One or two pc's with printers for FSM stuff. Keep in mind this would be a large annual expense.
Air tools: A lot of people aren't comfortable with them and will only hurt themselves or break something. Air hammer, body tools, impact sockets to go with air guns etc. Blow guns..
Trans jack
Engine hoist
Specialty tools: Things like a cam install tool, trans rebuild basic tools, jaw pullers, HB puller, measuring tools, odd stuff that you commonly won't need.
Press
gotta work.. brb