The TRES 3.2 is 3" wider than the TRES 3.1.
The VS65R is only a 2 channel amp with no reverb switching, so I use the AMP CTRL feature on the Boss OD-20, connected to the VS65R.
You can save 4 presets (plus manual mode) with either channel as an option and add a switchable OD to each preset.
I have looked into getting the newer OD-200 which is smaller.
But it has no AMP CTRL, so would end up taking more space with the need for a separate footswitch!
As you can see, I have the GT-100 in MIDI 5CM with my DSL40CR.
Two separate rigs for jamming along with a mate.
And, depending on my whim, I can run either the Pedalboard/VS65R or the GT-100/DSL40CR in stereo.
For the tray, I would either leave the tabbed end overhanging the center section, or have to trim and Dremel it to cover one of the side positions.
The CS6 definitely wouldn't fit in the center position with the MOD 1 there.
Velcro is the cheaper option, but a tray would allow more room for flexibility with cable routing.
Also am I right in spotting you using Pedal Playground for pedal board designing?
If not look it up.
They have the TRES 3.1 but not the 3.2, so I had to overlap two 3.1s.
PedalPlayground.com is an interactive planning tool for planning your guitar effects pedalboard.
www.pedalplayground.com