Do not throw away anything until you have the replacement you need.
I got lucky and found a replacement tank on ebay. It is a simple design so you can easily have one fabricated if you can not find another one.
The doors are different at the top from the Deco trucks but you may be able to take the top half of your door and marry it to the bottom half of a truck door depending on where and how bad the door really is.
My Burb was a school bus in NE Nebraska and since these are so rare I am keeping it almost stock. My major upgrades are disc brakes on the front, dual chamber master cylinder,3.43 rearend so I can get up to and maintain highway speeds and a 235 full pressure engine.