Very short answer:
I'm a realist. I've got an ex-road race MKII Sprite which has thousands of hours in restoration, so I've pushed the rock up the hill before. I have zero, no, strike that; less than zero desire to reinvent the car. I'll build a chassis based around a Miata/RX7 IRS, and pick a powertrain based on whether I intend to do SCCA class based autocross as a serious objective.
If that happens it'll be the smallest, most powerful non-bike engine I can find within reasonable cost. Otherwise I'll just tap my connections in the local sportbike/road race oriented shops and have the mad stuntaz rustle me up a 'Busa mill.
I make stuff out of mitered and mig-ed mild steel very frequently. A 7 chassis isn't a challenging undertaking except for restructuring my very small (11x22') garage to accomodate a working project as well as the Sprite, DRZ400 and KTM950 supermotos, an RD400, a Yamaha Zuma, 60 gallon compressor, air dryer, blast cab, parts washer, 40" base and top cabinets, a bench, a flamables cabinet, a 20 ton press, tig, mig and gas welding and a plasma cutter....I forgot. Theres a 21'6" rowing shell, but it hangs from the ceiling.
I intend to get the table placed, and to move a small horizontal bandsaw from the machine shop in the basement up to the garage. Once I'm cutting and tacking tubes in I expect I can get the basic chassis together in a couple weeks tops.All the suspension bits will be done in SolidWorks from which sheet drawings are very quickly extrapolated. The objective is to waste as little work time as possible. It's designing parts, drawing parts, cutting, machining, or welding parts.
I'll buy the IRS, front hubs, rack, shocks, Heim joints and bushings, brakes, M/Cs, steering shaft/hub/wheel, wheels+rubber, engine+ancilleries, fuel cell, and bodywork pretty much all at once. I've got the steel already, and plenty of wire, tips, gas, blades, and grinding/cutting consumables.
So. Ix-nay on the E-max-vay. Gotta get this thing underway.