There's no special requirement over a hard driven track day car, just build and tune the car with the fact that it needs to keep going without fail for 5 and a half days of competition.
So, the biggest issue is the RB26, you must keep them cool, we've found they last much longer if they run cool, 78-80 degrees, and yes, keep the power to around a genuine 330AWKW. All the obvious oil control issues need to be taken care of too.
Coils are also a constant concern, fresh ones help alleviate any concerns.
Chassis wise, make sure your wheel bearings are good, brake knock off is a serios consideration on rough roads with big rotors, and springs behind the caliper pistons are required to help eliminate it. Otherwise as you know the driveltrain is strong.
A solid sump gaurd is also something I'd recommend.