Just a quick update to bump this thread back into the Land of the Living!
After looking at various Locost/Lotus/Caterham/Westfield frame configurations and body styles, I have settled on building something close to the Caterham Roadsport SV. 90.75" wheelbase, 56.93" front and rear track, 66.34" wide, 136.22 long. I bought an SV nosecone and S3/SV/CSR rear wings from Caterham USA which should be arriving some time in late September. Also, many thanks to Skip Cannon for taking the time to measure his Miata 1.8 Turbo Caterham Seven SV (http://www.britishv8.org/Other/SkipCannon.htm
The Miata is completely stripped at this point. For those of you debating cutting the body up yourself or having someone haul it off in one piece, I strongly suggest the former. It's very therapeutic. I think I went a little overboard though, hacking it down to 24 bite-size pieces! All on a single Irwin Marathon 9" 10 TPI Demolition Blade for $2.67 at Lowe's.
I also picked up a 280mm Momo Team steering wheel and a NB vehicle speed sensor to convert the NA transmission to an electrical speedometer from Panic Motorsports. Thanks Chet for the lead.
Hopefully, I'll have enough parts soon to actually start building something. That and get all of the other projects out of the way...right now the kids' swing set/fort is top of the list.