For something that short and small, I would simply shim up the spars. As Ty mentioned, the LE and TE will remain on the same plane.
Draw a center line on the root rib and the tip rib. Then shim the spar so the tip rib is level with the root and that will work. I also cut a piece of balsa to sit under the TE of the ribs. They are very weak (usually) until you get the TE and some sheeting installed. The TE shim will be a constant height.
Hope this helps,
Ron