One of my fundamental principles in life is never to try to create your own wheel when several already exist.
There is quite a significant "maker" movement - see
https://www.themanufacturer.com/arti...aker-movement/ - which I think would include the 'men in sheds' space, along with the 'hackspace' community -
https://www.hackspace.org.uk/ - of similar intent.
Some of these are really rather well-equipped, with stuff like flypresses/guillotines, CNC machining, 3D printing, MIG/TIG welding, four-post vehicle-lifts being not unusual.
(Must admit, I don't like the term 'hackspace' though - to me the term 'hack' implies criminal misuse of computer facilites - something I spent the last ten years of my business life defending against!)
Of course there are inevitable insurance/liability issues - you don't let a newbie loose with a flypress.
Rather than starting up a 'men in sheds' why not see if there's a hackspace/makerspace near you?