Nice looking car Bugzie.
The Nexen tyres are apparently quite good, according to others who have them (haven't tried them myself). Some folks say the whitewalls are difficult to keep looking nice, and many are just whitewall rings rather than built into the tyre.
Looks like the wheels are 4 lug, not 66 5-lug wheels, so have the hubs been converted, or are there adapters behind the wheels?
If the radio wont work because it's 6v, you can get voltage dropping devices which will enable you to use the 6v radio. If so, that keeps the car looking period.
The interior bulb has a three position switch - On, Door and Off. The door switches are not very high quality and sometimes need a cleanup with emery paper. One side of the bulb is "hot" all the time and the door switches earth the circuit to complete the connection.
You can get wiring diagrams for your car at
www.vintagebus.com
get yourself a Bentley or Haynes manual (Bentley is more comprehensive), but make sure it's for the correct model of car - both books come in several versions.
Muir's How to Keep you Volkswagen Alive is good reading too, although he does have a few pet hates, like dumping the perfectly good auto chokes. He likes 009 (non-vacuum distributors), which are known to be a poor choice these days. And he likes to polish his commutators with emery paper (shudder). But it's still entertaining and very enlightening reading.