rear seat pads n covers...whos???? how????

I need to recover my seat frame top and bottom of the backseat. Any how tos for these?? My frames had to be modified for my tubs. So must use my own frames I currently have. All the seat covers had been pretty torn and rotten. So I removed the covers and foaming which was not much at all. Also the bottom sest portion had a woven layer that caught fire. It had wiring through out it I figure for support. Any helpful threads or ideas how hard it is vs cost to have somebody else do it??? Front seats are carbon fiber so black is a must.

I also have to modify my rear side panels or make new. What kinda backing board is prefered? The lighter the better. Perhaps a thin sheet of plasic trimmed to fit would work???