Sorry, I meant to say start with a 6U case, not a 9U case.
Regarding the pedal, does it have a MIDI output? Normally to integrate pedals with Eurorack an ext module is used that amplifies/attenuates the outputs/returns.
For example
https://www.modulargrid.net/e/addac-system-addac200pi-
it has 2 channels (for two independent pedal lines).
Best regards,
-- ferranadsr

Cool, yeah the 6u would be ideal I think.

Microcosm has in and out midi, I also have Strymon Night Sky and Volante. Both have midi in and out. I just seen this Strymon module on the Nano samples case youtube videos, would love to incorporate my guitar and pedals, never thought that was possible.
https://www.modulargrid.net/e/strymon-aa-1
is that much different from the adda one you linked?