I dont like the opposite build at all..
The 5 levels of WIzard significantly enhance the rangers abilitites.
Flip it and what does 5 levels of Ranger give a l11 WIzard? 2wf, Bow Str, a Fav enenmy... Not exciting.
As a l10-11 Wizard your going to miss l12-16 wizard a LOT more than your going to miss l12-16 Ranger levels on the proposed build.