I'd prefer not to need another cab... I'm curious about the term dedicated PCB - are you referring to the board shown for the rectifier or the main PCB?In case of the use of the dedicated PCB I'd use a dumble style chassis. It's about 2" longer and 1" wider.
I did a quick search for dumble style chassis and there seem to be some options...I used to have a press brake years ago but maybe it's time to see if a hand brake could be used for chassis builds...