BH.7 Mk 20 MCM (WIP).
-I think that the existing PAP 104 ROV is out of scale (will check that). Real thing is 2.7m long and 1.2m in diameter.
-The blue line in bow indicates the position of 30mm gun.
-In the other side of the ROV there is a inflatable (if the Mk 20 MCM hovercraft built, inflatable would possibly an 5m Avon)