[MrForbes]

Ah, I see.

I think if we decided that we needed to make a "double decker" chassis, we'd probably use something other than the kit parts to build the chassis. The kit pieces work well to make a single layer (that's what we're using this year, for the first time), but it gets difficult to add much stuff on. Of course it's kind of late to change designs now, and it looks like your plan will work, it's just a lot of effort to make all those little parts. We spent the past two days making 4 brackets that hold the top end of our tower together (and provide the arm pivot point), and 4 more that hold the bottom end of the tower to the kit chassis.