Heres some pics of my tank installation.
The tank sits on the 2 angled formers in the fuz, between these 2 formers I epoxied 2 balsa rails between the formers just for the zip tie to go aound to secure the tank.
Supplied with the kit is the peice of ply with the hole in it to hold the front of the tank, I made up a couple of angled wedges and epoxied them at the base of the plate and then glued them in place on the front angled former.
At the back of the tank you can see a peice of balsa glued to the servo tray that stops the tank moving backwards.

Theres no need to remove the tank.

I use a White 59mm Irvine plastic spinner with aloy back plate...perfect!

Hope this helps.
Jason