I think it's more of a question if box2D is the correct solution to implement for physics-calculations in the first place. As Vuo already has a lot of the base components that you'd want from box2D (layers/bounding boxes/fast memory management etc), I'd wager that it would be a neater and better solution to implement a native system - especially when considering 3D as well.

The physics calculations themselves are pretty straightforward, it's all the stuff around it that is the hassle. I have tried to make a few physics-ish-nodes, but the issue is mostly how to make a good user experience in the line of; do you want it to input layers/objects and manipulate them? Or do you want to generate layers from a master node? Do you want a "world" node to connect layers to? Or could a "Make Layer/Object with Physics" node be simpler? Knitting together a nice workflow is probably the largest piece of the puzzle, but that is an issue if you use box2D as well

Easiest approach is to use a make noise value instead of random value.