help with Seat Foam

[Hottrucks]

I got that part of it but it seems like there was ..pre mice and dry rot ...a piece of what looks like berlap between the springs and foam....I think it was there to disperse the weight more over the foam and so the springs ddin't cut it (foam) how it the NUfoam for strength?? you can see in your 5th pic the pattern left by the old Berlap?? but I like the idea of adding a bt more underneith the spring...another question would be can you move some springs around to get someof the worn out ones to the middle of the seat or something??...Just asking before I dive in since you have been there and have a better idea of what things look like..I think I may carpet my truck and redo the seat since it will be out anyway