I have to run out the door for work, but here is one to start.

1) Here i cut the top (facing you when plane is upside-down) of the fuse former.
2) Add some small hardwood pieces to the sides of former to make a spot for the screws you see in the picture. They only need to be as long as the screws.
3) The cross member you see is 1/8 x 1/2 inch hardwood strip with screws. this reinforces the former back to it's original strength. and holds the tank in position.
4) I added thin foam under the tank to protect it from abrasion

As you can this provides a nice place for a tank.
Notice in front of the tank is more room, and more room at the original location for the tank.
Servos are in the tail.

I can post more pix later.