I'm still not sure what you mean by "more race than street". The SLC (all SLCs) are already more race than street. It's super low, has a high hp/weight ratio, is very loud, has a stiff suspension that's very low for just about any urban setting, and has fixed windows and no view out the back. Do you mean you want to build an SLC that has no interior accommodations apart from bare metal and a seat/harness? Apart from electronics and upgraded interior, just about any SLC out there would meet the description I gave above.
Even for a "race oriented" SLC I'd consider AC mandatory - but with no heat blockers or seals anywhere it won't do you much good for very long. So if you get yourself the kit and don't put any sound or heat materials in there, toss the interior pieces, install lights, and bolt the shell onto the chassis. That's about as close to track/race car for the street as you're going to get. When it came time to certify my car for CA registration purposes they checked my lights, brakes, and that's about it ...