Guess we're both going to be passing some ideas back and forth. I'm starting my build this weekend (I'm on vacation for the next 3 weeks
). I've already got my mods set for the joiner box. I've ordered a 1/2" aluminum joiner rod from hilaunch.com. It'll be mounted inside some 17/32" brass tubes, which will just fit between the spar caps. As per Schrederman's suggestion, I'll box the tubes in with 1/8" ply and wrap the whole assembly with carbon/kevlar tow. I'm also replacing the welding rod poly braces with a 1/4" ply setup- just like what I did in my Laser Arts Majestic. I'm not exactly looking forward to cutting all those wing ribs, but if you're going to scratch build, make it a REAL scratch build!
Good luck with your project!