Classy, I can use any info from your story that you might share.
As I noted before, my "creature" will still be street legal, registered as a Cobalt or as a modified/kit car.(That part is up to the state of GA.) Either way the 'envelope" of the body will be seemingly unchanged, same wheelbase ETC; with a bulkhead behind the front seats, the top 6-10 inches in plexiglas.
I intend to cut the front half/"cage"(from the firewall forward) off a DONOR Cobalt. (Behind the lower front subframe mounts and above the strut towers, likely leaving the firewall intact initially.) Then with the coupe "body" on the lift, I'll raise it up, remove the beam axle and fuel tank, cut away some of the rear floor. With the donor front subframe and suspension attached to the donor "cage" standing leveled and squared on the floor, I'll carefully whittle bits away from both the body and the cage until the two meld into one. Then I'll begin reinforcing as needed. (I wish I had a computer modeling system to ease this experiment!) I am hoping you can share any pitfalls/ dead ends you have run into. Sadly, I am not slated to be back to my garage until late February.
I read with interest your desire to use a KIA body. That is beyond my price range! (Me?, I'm frugal probably to a fault.) That KIA body with a transverse LS motor certainly looks cool! (I have 2 (a 01 and a 04)Silverado's, so I have mucho happy LS experience

.)
If you're not an old guy like me you might look up the Renault R5 Turbo, built from a Renault LeCar. Plenty ugly, but it goes like a spotted ape! Detomaso's Pantera and Mangusta are also inspirations. I have had the circumstance of having worked on examples of both. I've also worked on stationary industrial Generators and Donkey motor installations for AG irrigation, so I guess I see engines/transmissions different than most folks. Give an engine oil, gas, a battery, a cooling system, a simple roof and foundation and it's happy. Oh and keep it above the flood water!