The door just closes into the door frame.It is an "s" shaped step.I reshaped and closed up all the gaps when I made the molds for the body and since the body was molded in one piece,door frames,jambs and all,there was no adjust met allowed for. The door is made with a molded inner and an outer skin which are bonded together IN THE OUTER SKIN MOLD,makeing it a totally ridged structure also. The doors do fit tighter than a stock 28,about 3/16" all around. When the inside trim panels are fastened down the push the windcord out against the inner door surface.For this reason you dont want to use too large of a dia foam rod when you make them. Actually they might be more conformable if a rubber or vynal tube was used instead of foam rod.I can try to get better pics inside the jambs if you want.