After a lot of work, I just managed to get everything to Notts Gaussfest. This was really the first time all of the pieces had run together for any length of time.
I found a number of issues. The belt stuck together at high charges, usually stopping the belt completely and the motor control would crash when there was a really good discharge.
The motor problem was a partially solved by coating the controller in aluminium foil, which at least let me run the VDG for the day at Notts Gaussfest.