I built a CMC Locost 20 years ago. So did GRM. It's a Lotus 7 replica that has IRS (custom control arms, not a Miata subframe), a Miata engine and transmission and comes in at roughly 1200 lbs wet. They're a complete riot.
While building mine, I was in contact with a fellow named Wade who was also building a sister car. I recently heard from Wade's family, he has passed away and they asked if I knew anyone who might be interested in his car.
The good: The car looks great (albeit dusty) and apparently Wade purchased some hop-up parts from Flyin' Miata such as a built head and some fuel components. More details to follow on that, but it bodes well.
The bad: The car is NOT registered and does not have an MSO. CMC is out of business so it would be a challenge to get another. We have pics of the car at Mid-Ohio on Kumho V700s so it may have been a track toy. It may be possible to register as a homebuilt, but there's definitely a challenge ahead.
I've asked for more pics of the engine, etc. The family member mentioned $5000. Car is in PA. Let me know if you have interest and I'll put you in touch.