i was hoping for a one stop shop that i could just drop off the complete rims and then collect re spoked and chromed etc
you'll be lucky
you want a chrome plater that not only strips and chromes your rims but wheel builds as well?
such a creature does not exist.
As a rule platers do not like re plating rims, the spoke holes rip their very expensive mops and abrasives to bits.
the insides will be rough and rusty and if plated will be rough and not shiney.
The best you will get is a plater that will polish the outsides for bikes that have painted centres.
all that will cost a much as new rims.
You ought to check out what goes on in a plating plant to realise where your money goes.
As for your tank it was silver if a genuine dommi.
Why dont you check with the Norton owners club for colour codes?