Mujoco is open source. Isaac is only “free to use”. Well, nearly free becuase to need one of these to use it
As long as you are simulating, why not sim the G1? The G1 is a much more capable robot than is the R1. It has features that were designed to make it usable for doing things with its hands and arms.
R1 has 5 degrees of freedom arms while G1 has over-articulated 7 degrees of freedom in each arm. This means R1 would have a hell of a time using a screwdriver.
The problem is that a 5-DOF arm cannot simultaneously control position in (x,y,z) and orientation in (roll, pitch, yaw). If you count “x, y, z, roll, pitch, yaw,” you get 6. The R1 arm can control any five of those, but the other will need to be some random result that needs to be corrected by odd torso leans and twists. Can it do that and still balance over its feet? I don’t know, you have to try in simulation.
Both humans and the G1 have 7-DOF arms, so we actually have an infinite number of solutions for every position and angle of the hand. Having an infinite number of solutions allows us to do things like avoid making contact with the wall while turning the screwdriver; we naturally know to move the elbow to avoid it. With so many solutions, one is likely to be better.
R1 and G1 are about the same (except for size and power) if all you want to do is walk around. Both have 6-DOF legs. The difference is in the arms and waist.
So, I’ve pretty much decided I’ll simulate a G1. But files are free to download. Then later, if I want to move to hardware, I can edit the file to match whatever the hardware design happens to be. Files are easy to edit so I can try stuff out and see if the idea works.
Oh, about the above, you could always rent a GPU. It is free for the first so many hours. After a few months, you’d know how much compute power you really need.