All stainless, chrome and aluminum was refurbished by Sihilling metal polishing in CA. The only trim not done was the rear tail light panel, windshield and back window surrounds and interior roof trim. These were already in exceptional condition.
Contrary to popular belief the s38 does fit in the E9 without modifying the firewall in any way. I will however have to rethink using the 92 S38 coolant setup with a swap to the older 88 E28 setup for adequate radiator clearance.