Trades - honestly it would depend on what you have in mind, but not something I'm opposed to.
The difference in kits depends entirely on whether it takes classic parts with a separate firing can and breech or has the back end of an XE. I've done kits for Lucky/GCPB bodies before too. Let me know specifically what kind of body you have in mind and I'll let you know what needs to be done to it to make these work with it.
blackrain - I'll shoot you a message as soon as I have another batch ready to go.