Your best bet would probably be Washington Federal Savings who currently still does construction loans and permanent financing.
Before diving in too deep, you'll want to find out what it cost to finish the home. Keep the bids conservative and expect overrages.
Eagle Home Mortgage is also a good source.
I can broker loan transactions to Washington Federal but feel you'll likely be best handled working with them directly. I also have a name and number of a Eagle Home Mortgage loan officer who specializes in construction if you would like his info.
If you're using a competent lender who is used to working with contruction or rehab loans, it seems like it should be a pretty straight forward process for such a small amount of work.
Karen McKnight gave two good lender referrals, who I know to be competent, so start by calling each of them. I know a few more to try as well.
I highly recommend you contact Deborah Still with Golf Savings, 206-423-5385. She has been a lender for over 15 years and if she cannot currently do these loans, she could direct you to a good source.
I also recommend Dianne Backus, a manager of the Bellevue office of Washington Federal Savings, 425-641-3530. Washington Federal has always specialized in construction lending and portfolios their loans, so they do loans that "make sense".
Good luck in getting your loan. Please tell the above two lenders that I recommended them if you decide to contact them.