A long front bench with steel table top and tool wall.Or a lrge roller tool chest.
Compressor,and,wind up hose on the wall .Welder/oxy.
Sheet metal bender.
Lock up cabinets dynabolted to the floor.
Head room for roof storage.
Nuts,bolts,rivets,clamps,electrical connectors ra ra ra,all in slide trays under the first level of the bench.
Pit.
Fire extinguisher.
The garage:Small Sink,bar,Fridge and tap (no not beer tap) Sigh i hear him say.And a drainage mote' arround the garage
Most of all you need room to swing so the bigger the better.