So a bit of an update from then to now.
Found replacement leaf springs and rear end.
Bought parts from Japan; GX and standard bumpers, rear bumper, rear cut to use for said bumper, marker lights, spare taillights, badges and works overfenders.
Acquired a '77 B210 for spares.
Full T3 510 front suspension.
Found a H165 and front seats from a S10 200SX.
Rolled the '78 in January.
Stripped down the '78 to rebuild the '77 "parts car".