After designing our current system, we always figured it was sturdy even though it was minimal; but now I guess we have proof.
Here is a photo of our bumpers that when they got hit tore off part of the chassis, with the bumper still attached. My understanding is the attachments were not affected, and after the pieces of chassis were reattached, worked as designed for the rest of the day.
And a picture of the system itself
Not too bad I would think 
That’s a pretty neat mounting system, might have to borrow that
Your welcome to it. We use it because it works kind of like slide snaps, but it’s WAY cheaper, and easily adjustable.
What are those brass coloured pieces that the screw on the chassis goes through and the R-clip engages with?
Are there nuts on the other side for the black countersunk screws?
Have you had problems with the wood splitting along the grain? My son’s team used similar dimensional lumber an had problems with the wood splitting.
Yes. We use T-nuts on the other side
Usually we use plywood. I think we used the dimensional wood while we were prototyping the design and that’s the one I had a picture of. I didn’t notice it honestly. (I’ll have to talk another picture LOL)
We also were having trouble keeping the rope that ties to the R clip, actually attached to the R clip. We solved that by slipping a small piece of electrical shrink tubing around both, then tying the knot.
We are still working on perfecting the L brackets to make them easier to manufacture. We currently make them from left over pieces of chassis. But the holes need to be fairly precise. It can be difficult for a high school student, who’s never really used power tools, to pull off. We are thinking about 3D printing them.
That’s a clever use of a COTS part.
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