I don't see a reason for them. The plywood wingtip adds a lot of strength and rigidity to the wing.

Ihave the wing nearly completed, just need to work on adding the torque tubes and ailerons, and its done. Well, done by the book, once Ihave the fuse assembled I will go back to the wing and do the pin blocks for the bolt down mod.

The Dihedral is 1 3/4". Should be easier to fly upside down, and have a bit more performance to it.