Here are a couple of photos I just took with my model. The first shows the model (with the same lead weight it had on it's last flight) balanced at 9cm. In the second photo I'm balancing the model at the 12cm point. This is obviously far too nose-down with the weight I have in there now. But it flew uncontrollably when I had it balanced at the 12cm point for the maiden.

I'm sure Chris was aware of the Dave Platt design (and maybe also a Boddington SE5). I'll ask Teus (again) where he balanced his CDScaleDesigns SE5a.

*****

PS. The Platt design looks great (which is unsurprising). Personally, I don't think CAD design has much to offer WWI modeling.