Repairing dry wall is not all that hard all you need is a piece of sheet rock and joint compound. If you really wanna know more I can help. Are you planning on upgrading the light?. Lotta people stay away from the home depot inclines, maybe as a duct booster if air has to travel through duct along way. Have you looked into a 4in fan like vortex, can fan or even the squirrel cage exhausts. Any of those would be plenty sufficient. Even could hook it up to a can filter and just leave it on 24/7. Replenishes air constantly, no smell, exhausts heat when lights are on. Hang it high in the closet. Fan can be in or out of the closet depending how you can set it up. And if you plan on putting holes in the walls, dont make a bunch of nice and remember measure twice and cut once.