Right now, with all of the different theories, there is no fathomable way to estimate costs, niether is there a way to acquire the certain materials to make one.
Depends what country your in.
First of all you have your;
1. Plasterboard (presuming you are refering to dry wall plastering)..
2. Your setting material (ie. joint compounds)
3. Cornice.
4....
The cost of a door will vary depending upon exterior or interior. Solid or hollow core. Size. metal or wood. The price for installation will vary as well depending upon doing it yourself, hiring a...