So I keep meaning to do something more elaborate for the BMMCC but never have the time but I had an hour free this afternoon to knock this together for anyone who wants something cheap and easy to base a DIY controller on. Basically, its a 6 channel servo tester that costs £15 from Amazon ( https://www.amazon.co.uk/LewanSoul-Channel-Digital-Over-Current-Protection/dp/B073XZH264/r ) and a £5 solder less VGA breakout from Amazon ( https://www.amazon.co.uk/sourcing-map-Breakout-Connector