Tempest V 20mm

Thanks to both of you for this helpful information.

I have this kit and yes it is a huge improvement on the Airfix version but what I really want to do is convert it to a WW2 version without booms. I can see that it would be feasible to open the rear doors and but in some scratch built hose reels but the non boom versions also had some additions on the top of the vehicle any advice on this would be appreciated.