I wanted to have operating missile doors. No firing missile at the moment but I may hide a wireless camera under there. As I was only going to make 2 door, I didn't bother with making a mould and simply cast the door in situ with epoxy putty.
First stage is to cut out the doors and file to scribed lines. I then placed a plece of plasticard below to the same countour as the hull form. Any small gaps I filled with filler.
Next step is to coat the bottom of the plasticard and the sides of the cut outs with vaseline, and fill the hole with epoxy putty.
Once set, sand it flat to the hull shape ....
Now with some luck and crossed fingers it pops out in one piece when the plasticard floor is removed.
Whats left is a nice fitting pair of doors of scale thickness
The next step will be to split the moulding down the middle to form 2 separate doors and do some tidying up of the edges so that they can be fitted and removed with minimal resistance. Then the hard part, getting them to open under radio control.