@DynaGlide does workcenter fit on top of the flex vce without systainers in between? I want to have my ct-cyclone between the top and bottom of the workcenter
My understanding of why the Sys-sort is in between the Flex and the Workcenter is to "convert" the Classic Systainer attachments into a T-Loc compatible attachment style (it's also a handy storage solution, obviously). Then the board is there to mount the Workcenter because the Workcenter doesn't mount directly to a normal T-Loc or Classic attachment.
The Workcenter base is shaped specifically to mate up with a CT-26, 36, or 48 but not to a Midi, Mini, Midi-I, Mini-I, nor CT-15. You also can't mount a Workcenter directly on a Classic Systainer (I learned this the hard way with the MIDI-I, so I ended up with a CT-26, and I just tried it on a Classic Systainer about 5 minutes ago to make sure I wasn't speaking out of turn).
If you didn't already know, the CT-VA-20 (cyclone) definitely fits in the Workcenter, but if I understand your concern, it's more about getting the right height for the hose to reach.