after lots of trial and error i got the drivetrain and chainline dialed in just about perfect, it's less than 1/32" of a inch off front to back left to right. works great, and front crank spindle is about 1/8" forward of center of seat tube after tweaking chain length and eccentric adjustments. tg: i tried to will the boom tube to grow 1/8", but no such luck....

austex, i'm using 172.5 cranks.

thanks again everyone for the tips.

i'm glad i put this together myself because now i know exactly how everything works. the drivetrain and chainline, plus eccentric, was a bit intimidating at first.