I don't know how to code lua, perhaps somebody can write a quick script to change my player model? I would like to make for certain groups as well and restrict models. Is there an addon on this already perhaps though?
you can change your player model by holding "C", and going to the top left to change your model. As for groups, you need to go and open ULX, then go to "Groups" tab, and make a team for the group (GROUPS AND TEAMS ARE DIFFERENT), then after you made your team and applied it to your group, you can add a model that will be specific for that group. As for restricting a model, I'm unsure if there is a addon made to restrict player models, I do not know if such exists, but it most likely does somewhere on the internet or facepunch.