Thanks for your replies!!
Prewar harleys are 2 RL 45cui bikes, one 1935 completely done, as pictured and one 1932 complete but building on it.
I am really in a discussion with my mates, and myself, i want to leave it like this and only make the engine a strong runner.
But i am now thinking towards, ONLY powedercoating the frame and swingarm, and covering it in (thin layer of underbodycoating and dust again to give it the patina again)
so that if in a couple of years i really cannot leave it alone anymore, i can progress real quickly with the restauration, and it stops the rust offcourse!