I suspect this is a common request but I thought I would give it a go. I did purchase a Cassette door from Ebay but it won't fit as it is a little too large. It is described as a 2nd Gen door - and I assumed (wrongly) that they would be the same size.
So, I have that if anyone needs it you are very welcome. No charge.
As for the radio band selector, if you have one you are happy to part with then please let me know.