After a long search for a case I ended up having to make one. Bent up a couple of channels in Galvanised Steel, joggled the top edges of the base and fitted three M3 "Rivnuts" per side. Pop riveted a length of 8mm square Alu bar into each corner. Drilled and tapped each end M4 before fitting, also counter bored the top face of the rivet holes so the compressed rivets wouldn't stand proud, looks nicer that way. Made front and back plates out of 3mm Alu plate drilled and Csk to accept M4 Allen machine screws.