My partner and I built 2 of these. One was a Kelmark GT, the other was a Karma GT. Both were replicas of the Dino 246 Ferrari. The Karma was a better kit. It had a front compartment that opened. The Kelmark didn't. The Karma had a reinforcement cage for the rear of the body that was an integral part of the body. The Kelmark had an optional support framework that bolted to the rear of the chassis and was only a contact support for the rear. Because of the long unsupported overhang, Kelmarks that didn't have the rear body support would eventually droop causing rear deck closure problems and cracking of the body between the engine bay and the top of the fenderwells.
The windows in both did operate. The doors were extremely heavy and on the Kelmark would eventually begin to sag due to lack of reinforcement in the hinge plate area. The Karma had a solid steel plate from top to bottom, inside the front of the door jamb so the load of the top hinge was distributed over a wide area. Both would get you wet during rain if you opened the door, unceremoniously dumping water into your lap because it had no drip rails.
Neither kit we bought came with side markers, though one of them offered them as an option. I don't remember which. We bought rectangular trailer marker lights and wired them into the lighting system. They were cheaper.
Both ours were built on VW chassis' and were actually quite peppy. Of course, we usually fly cut the engine case to accept 92mm jugs and pistons, installed a higher lift cam, dual port heads and a set of DelOrto twin carbs. Estimated HP was about 110.
Both the ones we built were yellow. The Karma had multiple vents in the rear deck lid to help engine cooling. It was a more precise replica than the Kelmark.