Yes, watch the weight closely...I think you'll find the wings sufficiently rigid when linked together, without the addition of a spar. Only 11" span after all. Fuselage assy. looking good.
Say, I just noticed: How you gonna get the pushrod installed? I built mine around it. .031 wire, pretty flexible, I suppose it can be flexed around enough to get it in after the fact, but it's liable to be a struggle. Or maybe you can do a 3-piece with a wooden dowel and wire ends, and assemble it in place. Or if you're good with a soldering iron, a 2-piece wire. Or...sorry, I'll let you figure it out.
--Ray