Robert:

It not so much the extra weight of dual elevator servos, because the difference is miniscule, as the location of the weight. If the model is designed to balance with the elevator servo in the fuse, taking that weight and adding it to the tail of the model is going to have to be compensated for elsewhere. I like to stick with the design of the plane when first assembling, then you know what flexibilty you have for later changes.

Additionally, building the plane as designed means you don't have to start cutting holes in the stabs of a $3000 airframe. I have a little adversion to that, but maybe it's just me.

Mike