Making it a tail dragger is not difficult at all. It shouldn't change the CG too much. It will shift it aft a little, but not as much as you'd think, because part of the process involves moving the main gear forward--thus offsetting most of the CG shift.

Move the wing position aft? What does that mean?

You won't have to move the wing at all. The AOA of the wing will be the same, once the tail comes up on the takeoff roll. If anything, it might even become less, if the tail comes up higher, and the nose rotates lower than what is allowed with the nose gear installed. All in all, it won't matter anyway--not with this plane. This plane would be darn near impossible to stall, as long as you're providing power. Make the mods, and you'll be glad you did.

Also, add the ailerons. There are post after post after post on RCU involving how to add ailerons to the kit. Not hard at all, and learning on a four channel (IMO) is much better than on a 3 channel. I know some people will disagree with that, but I like four channels (positive roll control).

OK, that is my $.02