By coincidence I was just checking the dimensions of a Lyen-type controller and a BMS this morning... both have a similar sliding case with inner dimensions of ~ 72 x 140 x 32 mm. With 78 x 145 mm at the moment we are very close, but a further reduction of a few mm in each dimension seems difficult. For the testing of the first boards it's maybe better to leave it as it is (works well for me!). Of course the future optimisation for a cheap chinese controller case would be nice, maybe (if waterproof) suited to be attached to the front tube.
What disturbs me... this mounting hole really hurts a bit... nowadays they attach loudspeakers with velcro to walls...
Modified Scott Nitrous "Chameleon" 74V 3kW with Rüegger-tuned MagicPieV2, Lyen 12FET, bluetooth BMS
(to be converted to Lebowski-Controller with temp.control and field weakening).
Quantya Evo1, Lynch motor, modified battery 74V 40Ah, Alltrax AXE 7245
e-Scooter vRone, Lynch motor, Alltrax AXE 7245
Dream: Quantya with Lebowski-Controller and brushless motor (Revolt RV-160, Colossus, Emrax 207, ...)