Nice bass!
As you say, it'll be difficult to replace the knobs with something that matches the original - they were brass finish (rather than gold) & quite a broad diameter.
If you don't like the look of the plastic ones, you could get something like this:
https://www.amazon.co.uk/VS004-Vintage-Control-Telecaster-Guitars/dp/B01M3S6L3E/ref=mp_s_a_1_1?ie=UTF8&qid=1549432720&sr=8-1&pi=AC_SX236_SY340_QL65&keywords=Guitar+knobs+brass+flat+top&dpPl=1&dpID=41jIB-3-NFL&ref=plSrch
- not too expensive.
I'm not sure about the truss rod cover, you might be right about it having been reversed, although mine is solid black.
Enjoy your Thunder ⚡ projeKtWEREWOLF!