Its going to be a case of lots and lots of small incremental changes. You are going to need to start making a photo catalog of all the different angles of P1075.
off the top of my head,
Gauge on port side, side sill.
cross over fuel system
internal radiator spline cover with extra bulge to clear the crossover system
B52 bomber marker light in starboard side rear arch
wider wheels
different wheel spinners
wider arches front and rear
clear Perspex wind deflector on front bodywork in front of screen
Marchal lower spotlights
Gurney Weslake heads and slanted intakes
rear lower diffuser panel with oil coolers
fire extinguisher nozels above rear window on engine bay side
Stewart Warner fuel pumps, think there was 3
1075 style steering wheel
gauges to match 1075
side marker lights
proper parachute style seats with rivets.
not sure what wiper mechanism they used.
I also think that the front radiator area and the support structure could be improved.
1075 had a single deep nostril panel as well I think.
Hows that for a starting point.