Hi Jon,
I think in the main you have been brilliant with your design changes and the discussion are hopefully positive. There are many little areas of improvement that can be and have applied at design stage and it is nice to see that you are willing to gain other opinion even if not so relevant to your need. Most who are in your position are just looking for recognition and take any suggestion as a criticism. Well done and hope this turns out to be a successful machine. When you get onto the electronics and controls, if you haven’t already, we can all hopefully help to get the best most economical in the market.
Regards
Paul