I am approaching this from the opposite direction R33 GTS-T to GTR running gear.
At this point I have a GTR dash, seats and trim installed.
I am currently building a full GTR cradle and diff to drop in with Bilstein PSS9 shocks for the December track day.
I have modified GTR Bilstein PSS9's to fit the GTS-T front suspension and retain the correct ride height and adjustability.
I also have all of the GTR additional braces for the floor, behind the motor and inside the boot to stiffen up the chassis.
Next on the list is a full set of GTR Brembo brakes to complete the running gear.
If I really start to get serious I also have a full GTR front (guards, bonnet, front bar, reo, grille etc) that I had painted to match the car when it was resprayed packed away in the shed.
I hope to have the handling and performance of a GTR, with the running costs of a GTS-T and lap times somewhere between the two.