So, I finished my DIY 35, built into the SCA-35 chassis.
I completely disassembled the sca-35, and cleaned all of the chassis components. I took out the middle section which everything mounted to, and held the unit together. I replaced it w/ aluminum angle bars to hold the chassis together. I took two aluminum flat bars and put them going across the amp, left to right, as support braces.
Then I mounted all of the components to a 10x12 aluminum sheet, which fits perfectly into the SCA case, on top of the aluminum bars.
Unfortunately I didn't get the idea to start snapping photos until it was finished. If anyone wants to see how it is held together, let me know and I'll get a photo of the under side. From there you can see all the screw heads, and aluminum frame I built, etc.
Here is the top of the amp
There was barely enough clearance. It's pretty much like the original SCA35, in that the tubes are about 1mm below the mesh top when it's assembled.
I don't have it installed right now, but there is room for the original selector switch, so I could add another input, and wire up the selector.
I am going to put all the pots and knobs back on the amp, but none other than the volume (and maybe input selector) will do anything.
The metal work was actually pretty easy, and took about the same amount of time as stuffing/soldering the PCB. Doing the wiring took far longer.