Anticipating the drastic weightloss in the nose (coming from a 8x2200 NiCd pack) I knew some changes
had to be made to reach the correct CG. As it was, the weight was too much spread out in the NiCd configuration.
And I was nose heavy. So my aim was to get the weight much more centralized, and to get the CG spot-on.
Trial fitting the PQ pack I realised it was a slightly loose fit spanwise, and the bottom
of the pack did not touch the original battery tray. Not wanting to make any structural
changes, I made a "belt" from bubble-wrap material to make the pack fit spanwise,
and a strap with velcro to seat the pack on the tray.

I moved the Rx from behind the servos, to in front of the servotray, and placed it on it's side, just behind the battery tray.

The bubblewrap belt goes around the pack. It has a velcropatch on top for the Rx battery pack.
The blue strap goes lenght-wise around the pack, with a velcropatch on the bottom, to attach it to the battery tray.

Actually, the blue strap is first attached to the battery tray, and the pack is then placed on the tray

And the Rx pack goes on top.

Top view of the whole shebang.

With the Rx pack all the way to the back of the PQ pack the CG is spot on!
A dive test on a windless early morning showed a gentle pullout.
SWEET!!!

And how does it fly on this pack? It's a different plane! 15 to 18 minutes motor time at WOT.
You'd better empty your bladder before launching...