"ERROR: Can't draw studio model models/weapons/w_models/w_rocket.mdl because CBaseEntiy is not derived from C_BaseAnimating"
I have no idea if this fixable or not, thought itd be worth reporting
Set rendermode 10 on the brush if you're spawning it with pt.
Maybe this could be done automatically in the same way a model is assigned if one is not provided, given you can't get brushes to render anyway.
"ERROR: Can't draw studio model models/weapons/w_models/w_rocket.mdl because CBaseEntiy is not derived from C_BaseAnimating" I have no idea if this fixable or not, thought itd be worth reporting