I am using the standard rack mount cases from Altronics. They are not deep enough to place the board front to back. I have mounted it in a RU3 case, with the board going from left to right, valves upright.
I have mounted the stage 2 board at the back, to ensure short lead lengths from input sockets to board. I used a DACT shaft extension to get the input selector on the front panel.
Transformers are mounted each side of the GK-1 board. I require an even weight distribution, as I mount all equipment on Corian slabs, supported by inner tubes.
Photos soon (as soon as I work out this digital camera software.