Rob, our streamliner has the .090 panels stitch welded in the middle of the tubes, basically making huge gussets. So half of the tube is inside the cockpit, never been a question during tech. The rule is that you can't sit on the outer skin... you need a secondary floor and sides in the cockpit that also serves to retain arms and legs inside. But, as Sparky has suggested, you can never involve the tech chair too early in a build. I'd put together a little slide show of the build and send it in for review. It is really looking great and safe... the important part is safe.
