Those servos are pretty light weight so get everything installed except for the rudder servo, put the plane together and then see how it balances with one servo sitting on the horizontal stabs. That way you will see if you need one or two.

You'll need at least one in the tail to offset the Fuji or just about any gas engine you put on it. If you do decide to go and start learning 3D I'd get rid of those sport servos. They may be a higher torque but they will not handle the stresses of 3D or hard aerobatics.

I'm not saying they are bad, I used them on my showtime doing 3D and they got really sloppy in about 25 flights to the point the elevators were getting really bad. Keep a close eye on them. You can tell when they start to get sloppy. Just grab a surface and wiggle it, you'll feel it.

During the aseembly, you can get away with not installing one of the servo trays (passenger side) which will save about 4 ounces. Just put the battery and receiver on the center mount and the throttle servo on the left side (pilot side) servo mount.

If you look back in the first few pages, there are some fuzzy pics of my internal layout with the DA50 installed