Just repeating this. ^^
Those things were made to be repaired in a field, and I know they can be because I've done it. Unless you want to build a show pony that is "original" and better than new, then frankly there are lots of parts that can be made, or made to fit.
I know plenty of people around here who, when they need new parts, they make them. I have done that myself.
You can throw as much money at a project as you like, or as little as you can. All depends on how much you are prepared to compromise on "originality". We call people who insist on everything being just as it was when it left the factory "rivet counters"