Thanks Run87k.
After staring at the stock Miata subframe for a while, I decided that I would not be able to use it as-is with the frame and body style that I am going with, so I ended up making my own. I replicated the stock Miata lower and upper inner control arm pivot locations, minus the anti-dive angle of the upper control arm inner pivot axis. If you are able to use the stock Miata front subframe, it will save you a bunch of time, but I'm happy to share my dimensions with you if you want to make your own.
I chose the XXR wheels based on the style and size that I was looking for, and the price. I bought them online from Next Level Motoring which was the best deal I could find:
http://www.nlmotoring.com/Default.aspThe tire shop that mounted the tires didn't mention any issues with balancing them, but I noticed that they had to put what seems like a fair number of weights on them. It'll be a while before the car is on the road, so I'll have to wait to see if there is any vibration in them.
I am planning on using the Miata PPF, but it looks like I'm going to have to add a section in it to lengthen it in order to give the rear seat passengers at least some usable amount of leg room.
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Photo gallery of my completed Locost:
https://plus.google.com/photos/10397358 ... banner=pwa