I meant to give you this link a while ago.
https://www.us-army-military-shop.de.../K30:::68.html Most of their stuff is GM but some is reproduction so watch what you are ordering.
They might have some of the odds and ends you need.
As for the interior panels, I might be able to help you out. I made some up for myself and members here & could maybe do some kind of blueprint for you.