I have a Ziroli PT-17 87" 75% Complete for 5 yrs now, a Ziroli P-40 20% Complete for 3 yrs and I am currently building a 33% Waco which is 80% Complete. I haven't lost interest on the Waco just time is at a premium right now. I plan on going back and finishing the other planes but will probably build a couple more before finishing them.
I built a 25% Waco last year and forced myself to work on it every day, was a very tough build and tried my patience more than a few times. It became more of a quest than anything to finish that build. I find myself looking for the next project while I am still building a plane and that can get you into trouble with your current build. My next plane will be a 33% Curtis Jenny with a 174.5" Wingspan
Anthony