I am not sure of the size you need, but if it is a larger case such as 1o: or
so wide, your best bet may be to go to a metal fabrication shop and have them
bend some 11 guage ( which is heavy duty) into two channel shapes so that
when turne will mate to each other. This is used in a lot of  amatuer radio
equipment, but on a much lighter guage.  Most shops have a sheer which will cut the
larger peices to sizer and a brake which will bend them. You may consider a
lighter guage  for the top since touindicate you will not have that much
pressure there.

Just a suggestion

Eddie Turner, kc4awz

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