Vertical connectors on Kit Bot chasis

[smclean1969]

We are planning on putting our arm on top of the upper frame. Heavy is a relative term here and I think the total weight of it, including motors will be less than 25 pounds. Our minibot will also sit on top of the upper frame and that'll be another 10 pounds. So, not too heavy of a weight, but certainly enough that there will be a lot of stress on the upper frame during collisions or if the robot topples over.

[MrForbes]

Is there any way to attach the "stuff" to the main frame? it would probably be stronger and lighter, and you would not need to figure out how to attach two frames together.