Its been my experience that there are many reasons we build custom rifles; but hoping to get our money back through resale ain't one of them. You may be luckly and recoup 80-90%, but most people who will pay that would prefer to put that same money in the parts and have their own "custom" rifle built.
Go to gunbroker and do a search for "custom" rifle and I supect you will find a few high grade custom rifles by named 'smiths at very high prices that nobody will pay, but you will find many more "custom" rifles selling at 50-60% for that they cost someone to build. IMHO, our dream rifles are never worth as much to someone else.
Good luck
Don
