All of the comments here are right on. I've been building hot rods for 45 years and even the paying job have to sit once in a while. Some times you just get to a place where it's better to let a project sit rather than to push yourself to move forward. It seems like whenever I push myself on a project I end up re-doing whatever I did over again. Some time I will just pick one small part of the project and work on it and forget about the overall big project. After all, any large project can be broken down into a bunch of small projects.

My theory is much like the others here. It's supposed to be fun and when it's not, Don't do it. There will come a time when you will jump back into the project and have a blast again.