C1 is a thumb trigger for the left hand, AF-ON is likewise a thumb trigger for the right hand, cursor is the OK button in the middle of arrows:I'm looking at Marelux's website, on the photos it looks like you don't have a button for C1 / AF-ON / AEL / Pressing the cursor?
The right side has a pair of triggers between AF-ON and shutter release, one is video recording, the other is AEL: