Steffen, I have used a dark gray - I know its propably too dark, but initially I had planned to do it with the wheels up ..so ...
Anyway - the one at NASM has silver finish in the wheelwells and on the gear - even if its done at Dornier in the 70“ties its propably not correct. The instrutions calls out for "RLM Gray" ...
Who knows what happend that late in the war

How does RLM 02 look ? - light gray ?
Cheers/Jan