I made "command/C3" rhinos for my now defunct 501st legion marines (it was a star wars themed
SM army hence the logo on the side and roof).
FW used to have the repressor kit, but the resin bits NEVER fit properly with the rhinos.
Created the box for the raised roof with sheet styrene and the firing ports from strip styrene. The storm bolter on the cupola on top is magnetised, though. Front turret stormbolter was sprue and tube until I found a second one to cut down to use.