Just to add some to the Chit Chat...
I am about to start cutting panels from MDF. I have my trusty Bosh jigaw, and will be purchasing a Makita Circ Saw this week (18V LXT one, its one of the few 18v makita tools I am missing from my big Makita bag

) and possibly a router, although i'll borrow a friends initially, who has 3 Makita Routers

For my steel fabrication, i am set, with my Metal Drop saw, Cordless grinder, Makita 5" 240v, and Hitachi 4" 240v... Plenty of cutting and flap discs, and the welding done by TIG using my CIGWeld 130Amp Tig.
bolting the body to the chassis will be via Nutserts into the chassis and some M6 bolts.
I'm having sleepless nights on the worry of leg room and seat depth, having 310mm of leg room from seat to firewall/dash and a seat 110mm height, 275mm deep..
i'll confirm once the plans arrive and I mock it up and trial fit a mates 4 year old.
Its summer down here, so good to get in my cooler garage and get some work done. I also have the Keg fridge in the garage.