The climb / hang tool for the robotics team is done enough for now. In this clip you can see that the robot basically flips upside down when it tries to climb - so then I add our battery to see how it changes things. I can move the battery's placement to see how it affects our center of mass and therefore how we hang.

The tool now has a few real-world materials to choose from, and will automatically calculate the mass of objects based on their material and dimensions. It has a few options relevant to our team, and an option to override the mass for special cases (like the battery).

You can screw around with it at https://bvisness.me/apps/hangar.

(The mass of the battery is overestimated in the video because I forgot to change the quantity to 1...so there are two batteries, apparently.)