Thanks for the confirmation on the roundels for V-Tail configurations.
On the HK placement -- it took me a while get the alignment right. What I did was to set META to display the side view of the model along the YZ axis.
I then switched to Inkscape and rotated in increments until the HK looked "correct".
Anyway, it does look correct when viewed from the side. But the moment I rotate the model a bit, the image becomes slightly distorted.
I guess the only way to find out is to do that test build.
But that will have to wait till next weekend though.