Finished riveting brackets to the fwd bulkhead. Ran to Ace for some hardware store bolts and assembled the two bulkheads. Everything fits fine. BUT- The plans have you make spacers that are 1.438" (1 7/16)") out of hardwood that set the gap between the two bulkheads. This dimension is critical because the spar stubs for the wings slip in between there eventually. I don't see how in the world you can be that precise with a wood block unless you have a planer or jointer or something, which I don't. Never fear, Bueller Enterprises sells spacers that are really just chunks of steel tubes that are machined to the precise length and I picked up a set on VAF a while back. Bueller also points out that sometimes the thickness of the spar stubs has some variation, so you might want to measure them before you just blindly follow the number in the plans, and they sell longer & shorter spacers in increments of a couple thousandths. The ones I got used are the standard 1.438" and when I put a micrometer on the spar stubs, sure enough, they are about 1.442-ish. When Vans opened up, I called Builder Support to find out how much flex there is in that center section after it's all riveted together with skins on and whatnot. Sterling told me that it would probably be fine and that anything between 10-15 thousandths is workable, but that I could make it easier on myself by widening the gap a little. I can order oversized spacers from Bueller, or get some .010 stainless shim material to slip in there, but what I'll probably do is just put a couple of layers of painters tape on the ends of the spacers before I clamp it all up then confirm where I am by measuring again before final assembly.