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,