Are you an experienced flyer? Or a newbie?

If your experienced--then go for it. Don't remove ALL the dihedral. It makes the wing look funny. You can cut a new dihedral brace from hard aircraft ply and cut the angle down to 1/2 the stock angle. Even 1/2" of dihedral is okay. Set it up so that when one wing is flat on the table--the other wingtip is elevated 1/2" or up to 1" off the table. That will make the plane a LOT more responsive. Rolls will be smoother, and in general, the aircraft will be more responsive and less sluggish in aerobatic maneuvers.

If your a newbie--then glue the thing together stock and learn to fly first. Later, you can buy a kit and build it however you want. But, for now--just concentrate on learning to fly and don't mess with the dihedral.

The manufacturers build lots of dihedral into trainers for a reason. It makes the plane stable, and offers some self-correcting characteristics.