Fun Fact: I built my first EV, DIY, in 1993! It was an autonomous vehicle that we built as a senior project and shipped off to Michigan for a nationwide competition. It was terrible and I loved every minute of it. It was based on a Barbie Jeep, stripped to the 'frame' and built intelligent control systems to mount on the now flattened platform.
Come to think of it, it was a "skateboard" design almost 30 years ago!
More seriously, though, I'm an electrical engineer/software developer. I've owned a BMW i3 and am currently considering my own DIY build.
What has my attention right now is taking a Cadillac XLR, dropping the front and rear sub-frame assemblies with all the unnecessary parts, as well as the drive train of course. The car has a clean/rigid center tunnel as well as HUGE space where the Northstar V8 sat. The track is 62.2" exactly the same as a Tesla model 3, so I am considering the possibility of simply using Model 3 subframe/cradles and the goodies. I'm starting to chat with a battery supplier about potential battery pack designs.
I'm excited to have found this forum! By piecing together sub assemblies, it's a little less DIY, but I think would still be a fun project and a blast to drive afterward.