If you can, go see their shop or ask someone that lives nearby. they seem to come from nowhere and have a large selection at unbeatable prices, so at least be cautious.
Why the big price difference between different kits, material costs are about the same on all of them? and the embo, its going to be hard to make something look that good if you are not making moulds from the real thing (witch was only a concept rendering and not made to my knowledge).
Other thing, check kit three. they keep referring to mr2 accessories lower down the description when in the beginnig they say its got a miata doner, dont think a mr2 dash fits in a miata witout a lot of work. also, they say "You will use the stock door shell on the Miata, but you will attach with screws the kit three outer body kit door panel." interesting!

If they are legit, be sure they are producing the kit to a specification that you are ecpecting. Again if they are as good as the site shows them to be, its still is not going to be as easy build as extreme or dna who did all the homework for you instead of saying:"Door and trunk gas springs are to be gotten at  any parts store.

Actual head lights use bmw fog lights or select another type small round light from any auto parts store.

Windshield uses the 1996 nissan maxima and cut the corners.

Door locks uses any old 70’s or 80’s mercedes lock or use a 300sd or 250s or 280sel or 200c mercedes door lock."


I could be wrong but do your homework before you buy.

keep us updated if you find out more