Interesting looking collector!
I'm having issues constraining the nuts and bolts with VEX parts. They're all centered through the axis (I added axis in their sketch on all the parts but after that I found out SuperSonic 24# posted their CAD library and they did the same thing...

Yay for dedication...) and they're mated on both sides of the metal but it doesn't work. What's the offset for tangent constrain? And what tangent to what?
But for some reason it works when there's no metal in between...
Are the parallelograms on the side for lining up to dispensers?
Thanks!