That looks like a very nice blower - and 42" isn't a bad width. You would be right though - best if it is powered by an auxilliary B&S etc.
As far as some of the points Carl and Don raised ... these are easily addressed. I for one am not a fan of 2" of frozen snow on my face and the rest of me. BtDt more times than I care to remember and certainly never want to repeat again. Part of my snowblower project includes a vital part of Rick's project:
For those of us with long driveways and a Cub with no access to larger tractors on a permanent basis, then this project makes sense. I do agree with a couple more of their points, a project like this is not for every one just like my splitter project isn't for everyone. But as another chum stated, those of us on the forum that a well kinda nutty - we like the challenges and of course we like to be able to see just what our Cubs can do. It is also a learning experience. I know I would never have learned diddley about hydraulic power if I had not done blade and splitter project. I am going to take what I learned there and eventually have hydraulically operated chute controls both direction and elevation. I am going to have Cab as well and have been assembling some parts/locating other parts and ideas on a Cab.
I already have found 1 - 6 volt wiper motor from an old VW. Hope it still works. It has been in a barn for 30 years so I figure a rebuild should take care of that. And Romeo (Dad's cousin) had this for sale a couple years ago ... nice idea and within my fab skillset.