Right on, SST! (Quote: "...you want to do the best you can, but you cannot build a perfect structure from the woods we use, and even if you could, it wouldn't stay that way.")

I remember when I used to build free flight and glider models on my Mom's card table (too many years ago to even try to count) with a piece of fiber bulletin board as the building board. Don't know if it was flat or level 'cause - ohmigod! - I never checked it!!! But you know what? I built 'em anyway and every one of them flew! If there was a warp or bow, I steamed it out. Or adjusted the rudder trim tab to make up for the imperfection.

Gosh - no one told me I wasn't SUPPOSED to be having fun because my building job MAY have been a "few thousandths" off!!!