I’ve converted the measurements: battery 61.9 × 33.3 × 3.2mm, buttons approximately 12.7 × 12.7 × 12.7mm with 12.7mm pin spacing, and switch approximately 7.9 × 8.5 × 3.2mm with 3.2mm travel. I’ll use rear-left = Previous and rear-right = Next, revise the circuit and firmware, then re-place and reroute the PCB around those rear controls and battery envelope.