mart:
use the same extractor, just tig weld it up and reshape it. the forend attaches to the barrel with a simple dovetail threaded stud. There pretty simple actions, I have a cadet. You will probably have to bush the firing pin hole in the breach block and either reshape the firing pin or make a new one in a smaller diameter. If the cartridge your using is a large rifle; pin size should be about .062 in dia.
Bob