Mick: You would be miles ahead to just buy another unit. There is quite a bit missing from the one you have and it would take a considerable amount of work to repair the cover when you remove the two meters and the bulb sockets.
They pop up on evilbay fairly often, and I know of a Navy marked one, NIB for sale. Not mine....
I've managed to accumulate enough SCR-274/ARC-5 stuff for my Fairchild AT-21 restoration I think. Getting close to setting the bench up and making it all work.