If anyone's still interested, the game I'm currently DMing is a Skyrim 3.5 module I wrote a few years ago. I replaced the vanilla races, tried to port over all the Oblivion spells (but I'm rehauling it come September after my summer exams), attempted to add material scaling for applicable arms and armour, and am keeping an ever expanding monster manual of Skyrim enemies skewed towards whatever level the party was at the time of creation.
There was no system overhaul in that magic operates largely the same with some tweaks to arcane (currently, at least) and I did not touch the classes/abilities/skills/etc. It's simply just D&D v.3.5 with a Skyrim / Elder Scrolls flavour.