Full engineering shop only way to go
Hoist
MIG
TIG
Oxy set
Spot welder
Stick Welder
Hydralic Press
Sheet folder
Sheet roller
Pipe bender
Lathe
Mill
20CFM Compressor (3 Phase of course!)
Full kit of air and impact tools
4in, 6in and 9in Grinders
Cut-off saw
Plasma cutter
Guillotine
That should be enougfh to get you started