I built 2 of these kits, both had one major problem that I will point out so that you can try to fix before its too late.
The kits I bought were white resin, I don't know if it shrinks more than the gray resin but the windows did not fit. I had to cut them apart and glue the everloving crap out of them to get them to mount in the proper location. The "A" pillar is extremely difficult because the interior side is rounded, not flat.
The other problem was test fitting all along, everything was fine, but when everything was ready to screw the chassis to the body, something was hitting keeping me from getting them into the proper location. I still don't know what the problem was, but it could have been from the windows, in that my solution was bad.
Now that I think about it, the wheels are in the wrong place as well, they look too small and the ride height is off so move the mounting point of the front axle to try making it less of an eyesore.