Update for the non northeast 7s group chat members / rolling diary of work done to the car. Absolutely massive thanks to Des for showing up and pulling an engine, doing the clutch and flywheel, then reinstalling the engine in 4.5 hours.
Replaced clutch (helix), clutch cover, flywheel (lightened, half the weight of the stock), CRB and spigot bearing.
While the car was out, replaced a water rail temperature sensor. Wrapped exhaust header, wire rushed some cooling system pieces.
Replaced intake manifold gasket.
Need to adjust the ECU to recognize the new crank trigger, fill and bleed cooling system, and get exhaust bung welded for wideband. Adjust the clutch and then it's break in the clutch.
I think I figured out my rattle. CRB had significant side to side movement, causing the clutch fork to rattle side to side, along with forward and back. Hopefully the new CRB will quiet down this clutch fork play.
Small rear main seal leak that hasn't been affecting the car, so left as is.
Looking forward to bedding the car in before the Sept track day.