Looking good - a board to be proud of
The BOP not working is a serious concern. You won't be able to get it to do much without the BOP, or a serial connection (using the PC to Inverter connection kit). This may be a silly question (slap me if it is - I have to ask), but you do clip the BOP into the proper location in the centre of the unit, not where it is in that picture of yours?
By the way, is yours actually the analogue or the USS version? If the latter, the pot won't do anything - you'll need to use an RS-485 connection to send commands to it. The BOP should still function though.