Chassis recommendation?

[alank2]

I've been fussing around with a RFTG rubidium module for years, here is a picture:

http://www.ebay.com/itm/Lucent-RFTG-m-RB-CDMA-Rubidium-Control-Module-KS-24019L105B-/171022839833?hash=item27d1c17019:m:mzsasPEUOh3lxBFOYsoQaIA

My big problem was trying to decide how to cool it in this giant heat sink box it is in, and I've tried various things and am now giving up on keeping it in this box.  It is just too unwieldy, and honestly doesn't cool it very well either.  I've found that most of the heat is produced by the LPRO-101 module, and even then, most of that heat is produced in its base plate.  By removing the pcb and LPRO-101 and turning them upside down so the base plate is up, I put a small fan on it and it keeps cool to about 35-40 deg C with very little trouble.

The bottom line is that I have a GPS board, AVR based control board, and a fan to add to it and I want everything in one box.  That would be a vast improvement over the pcb's I have hanging over it with wires going everything.

The problem is finding a case big enough at a low price.  I've found the 1598J that might be suitable but it might be tight.  The RFTG pcb/RB module are about 9" x 6" on their own (1.5" tall).  It seems like if you find a suitable instrument chassis, that they are very expensive.

My question is - does anyone have ideas about a chassis that is low cost?  Something with a detachable front and back is a plus because I can cut the panels on my CNC for the front connectors and management VFD and the back for the fan, power switch, gps antenna, etc.

[dom0]

Two extruded aluminium heat sinks for the sidepanels, 10 mm aluminium bottom plate to mount the oscillator on. Apply some thermal grease between baseplate and the bottom plate, and between the bottom plate and the heat sinks. 2-3 mm aluminium top/front/rear panels and you're done.