I finished up the left lower longeron tonight by drilling the bolt holes into the engine mount bracket. If the holes don't look evenly spaced, it's because they aren't. For whatever reason, the plans call out oddball spacings (1", 3/4",7/8", 7/8").
The right side lower longeron was next and went relatively quickly. The only issue I found was that on this side, the longeron butted up against the angled longeron and wouldn't seat down against the bracket completely. I just sanded down the corner of the lower longeron about 1/16" to get rid of the interference. I usually try to keep everything pretty tidy while I'm building, but with all of the steel parts I've been drilling lately I've had to use a ton of lubricant on drill bits. That stuff gets everywhere and makes a mess! I'll have to really wipe things down well when I'm ready to prime.
The lesson for tonight: when you're sanding parts and the belt sander starts to shimmy away, don't absent mindedly grab it and pull it back over. You may just be grabbing the disc sander side of the machine. Needless to say, finger printing won't be an issue for a while.
