Well after a bunch of research and parts sourcing I believe I've sorted what's required for a BG5B/C 20H manual conversion.
For anyone interested you will need.
Gearbag(and matching diff/shafts etc depending on the setup you're planning to run) I'll be running a TY752VBCAA box paired to an EM code 4.44 Suretrac
BD/BG Manual tailshaft
Pedal set, footrest
Clutch master, slave & lines
Clutch, flywheel etc of course
Manual Starter motor
Shifter assy incl interior shifter trims
Transmission mount/subframe (If running twins the front & rear body mount pieces of the subframe share part numbers with single turbo but the centre section is different, unsure what changes till I have it in the flesh)
5G code manual ECU part # 2611AC581/582/583
ABS ECU, this will depend on the build date of your car
Complete Dash/Main engine harness from same car as the ECU
Will update once all parts have arrived to confirm everything works as it should.