firstly remove seat from car safely
I removed the leather and the white is the heated part that I had to painstakingly remove from underneath the leather.
the blue is the foam I carved and used high temp adhesive to glue on as you can see I labelled the pieces in place
then used 3mm scrim foam which is stretchable and strong the grey material, 3rd pic
the faux suede is glued with the high temp adhesive onto the scrim foam, then pinned in place.
the actual stitching couldn't do so took it to a car upholster which cost £40 to stich up