I hate do disagree with Robert; and I will say he is nearly right, but not completely. My GT40 has a chassis that if somewhat similar to a KVA. It has uprights from a DRB (GT40 Australia). It will have side windows from either GTSupercars or GT40 Replication Ltd. (New Zealand) The light covers, rear clip vent covers and gas caps are generic- in that they were not made by GT40 manufacturer. Seats, rack-n-pinion, steering column are other parts that "might" interchange. One would just have to look, measure and scratch his head over these. And everything would need to be fitted (but then again most parts made for a specific replica have to be fitted to one extent or another.
But to say I can just buy a GTD widget and it will bolt right into a RF, then Robert is right, it is doubtful. Can it be made to work? Maybe. But then again, maybe not.