Thought I'd better post some pics of the new battery setup. As you can see the batts are now on the ground floor, and the esc is on level one
Opposite to what I had done before. The batts are now a good 2 inches further forward than they were before. With that, and the additional wood used to make the battery box, I have hit the correct COG. What a relief, it took a while to sort it out but seems it was worth it.
There's just minor stuff to do now. Adjust the toe-in on the mains, cut the spinner to fit the prop blades, can't remember what else. Hopefully maiden within the next couple of weeks.