your attitudes to the miniatures are going to hinder your army, you have chosen the fastest and easiest way to do something new, but is new the answer. Were i doing this i would really ask myself if i had enough time to build and paint an effective army in the timeframe given and if the other miniatures i already have would be fine with a little bit of tweeking. despite your relevant arguments about wanting a change is now really the time to do it?
Are Space Wolves the answer? I don't know, but the list you have made could benefit from some fleshing out and you are investing to much hope in that Land Raider as seen in the game last Saturday.
At the end of the day its your list and your Arc and i would approach it differently, but you need to consider what you want out of both the list and the tournament (and the accompanying $60). Would you be happy with a this army, its looks, its results and the experience of playing it.
My advice is to take a list of miniatures that are almost (if not completely) all finished and to add minor adjustments to it, not only refining the list but allowing you more time to paint the miniatures and thus eliminating the stress of rushing.
Feel free to disregard this if you don't agree with it, and know that is you do decide to continue with the new i will provide any help you need to get it off the ground. As long as you are certain about the list
