Your bulkhead is interesting. I have modified an early 948 b/h to fit a later car, the main mod was to match it to the later pattern floor pans. This involved grafting a piece of a later b/h to fit. I also fitted a later type heater box as the early one was beyond saving.
Apart from that, mine is a real 'bitsa'.,... Mk1 Vitesse chassis, bulkhead as above, 948 bonnet, modified 13/60 estate rear tub, unknown doors, 1500 with o/d box etc etc .