It *is* a relief, I can tell you that. I put Danish oil on it (just in the places I had to sand on on the new side wall) tonight.
I also had a brilliant, if I say so myself, idea. Even as the finishing process progresses, I know I will still have tweaking to do when it is done. There are eye screws that go on the back side of each of the doors. They hold thin wires that pull the doors closed when the cuckoo retreats. They have to be set just right or the doors will either not close completely or will close on the bird. I am going to take a scrap of plywood and cut the shape of the door hole in it. I can mount the housing on that temporarily while the real clock is going through finishing and at least a little curing. Then I can used that wait time to get everything working just so. That way, when it is ready to assemble, the tweaking will already be done.
Pretty stoked about how well this is all working out. I just hope there aren't any other surprises waiting to bite me in the butt.