hatchbakc interior needs fixing, what parts are interchangable.

ok, well I redid my hatchbacks interior a long time ago and the seats turned out good cuz stitching is holding them on, but when i did the dash/panels/headliner, etc. the dap welwood contact cement i used didnt wor the greatest so the headliner sags bad now and all the vinyl has shrunk and exposed old material underneath at edges, and I am eventually going ot get civic si HB door panels and power locks/windows, cuz im guessing that for the door panels/headliner a civic HB is the only car I can get them from, but for the fornt seats and center console I am pretty sure most civics/tegs will fit, and I know my friend used to have a teg rear seat in his hatch but cant remember how well it fit. and about the dash I just saw a 4th gen hatch with a RSX dahs, so what cars could I yank a dash from to drop into my HB. its a 94 BTW.

ive been looking on ebay some auctions say can be modified to fit civic so just how hard is it ot fit an integra dash into a civic and integra door panels on a civic, also will civic coupe panels replace civic HB panels.