Jim said - "Use old chassis to make a chassis frame - just the sides and interior shield partitions, but no top. The top consists of various flat plates of aluminum, each with a section of circuitry, that are bolted to the frame. The sections could be: Converter, 80 meter tunable front end, IF, BFO, AGC, audio. Put the power supply on a separate chassis to free up space and reduce heat. That way different ideas could be tried easily." I once owned an HBR-16 (someone else built) that was built this way. Each module was on it's own piece of aluminum plate, each plate machine screwed to the chassis, and then interconnects made. It was a mechanical masterpiece and the builder had to been a machinist. Yes it worked well. This method would take more time to build but I can see the advantages of being able to simply disconnect wiring to and from the module, then replace just the module. It would certainly be wonderful for experimenting.