Commonwealth robotics studio doesn't seem to be suitable for designing typical FRC robots. It looks like it's meant to design and simulate robots that mostly consist of servo-driven legs around a central body.
The only open-source CAD option I've seen that might be suitable for doing this kind of design work is FreeCAD, or its Ondsel fork. There are not many people available to FRC teams to teach them how to use these programs, and there's a high risk of them running into serious bugs or limitations.
Most FRC teams use professional CAD packages (like Autodesk Inventor and Dassault SolidWorks). These packages are offered to teams for free. Many teams have mentors with professional experience using one of these programs. OnShape has taken over in the last couple of years as the most popular, because it is easier to license, doesn't require installation permissions, works on any device with a web browser, has an easy to understand and administer way for multiple people to collaborate on a model, and has a critical mass of community scripts, part collections, and tutorials.
Just to add, FreeCAD still doesn't ship with a way to do constrained assemblies of parts. You can arrange multiple parts together without any constraints on them, but if you want them constrained together then you have to pick an external workbench (there are 3 choices!) and install it separately.
SolveSpace has the capability built-in, but its constraint and geometry solvers are not robust enough for designing full FRC robots. It either gets very slow, or start saying that constraints are unsolvable (even though they are), or starts generating geometry with extra or missing faces.
The only open-source CAD option I've seen that might be suitable for doing this kind of design work is FreeCAD, or its Ondsel fork. There are not many people available to FRC teams to teach them how to use these programs, and there's a high risk of them running into serious bugs or limitations.
Most FRC teams use professional CAD packages (like Autodesk Inventor and Dassault SolidWorks). These packages are offered to teams for free. Many teams have mentors with professional experience using one of these programs. OnShape has taken over in the last couple of years as the most popular, because it is easier to license, doesn't require installation permissions, works on any device with a web browser, has an easy to understand and administer way for multiple people to collaborate on a model, and has a critical mass of community scripts, part collections, and tutorials.