That is exactly the project I am working on now. Hoping to have it finally done this summer (that is why I took the welding course)
I have a 52" 2 stage blower that is going to be mounted on a full frame that extends from the front to the rear drawbar. I haven't decided which engine I am going to use for this project, I have an 8hp Tecumseh Sno King, a 10hp Tecumseh Sno King as well as possible access to a 16hp Wisconsin as possible power units for the blower. The engine will be mounted in one of two possible places ... ahead of the cub itself .. but that posses problems in extending the blower out too far, and the other will be behind the front wheels in front of the op platform.
As Michael posted there are a couple threads on this subject:Snowblower for a cub?Farmall Cub with snow blower !Lookee What I Just AcquiredCub snow thrower power?Snow Blower project (UPDATED PICS)Another Snowblower project
This is not all of them... I searched the archives simply for Rejean
aka Qbatar on YouTube and got 18 hits so there is a bunch of stuff to look at.
One thing the I kind of figured out since I happen to have an IH50 that these snowthrowers are probably too heavy and too difficult to configure to use on our Cubs which is why I am still going to use my expanded 2 stage.
Rejean has already proved that a Cub can and will lift a 52" blower - his is an ATV sized blower and it is 52" or 54" .. I kinda forget. Best fit for a Cub would be 52". 12.5hp is more than enough to power a 48" blower. Remember though that the 12.5hp engine in a normal snow blower setup is not only powering the blower but also it is driving the whole unit at the same time -- so it is transferring at least 50% of it's output to the drive train. Remove the drive train needs and all of a sudden you have much more power available to power the blower. Also depending on the design of your drive train for the blower such as a gear box or belts and pulleys will determine the power requirement as well.
If you can fabricate a mounting bracket for the blower lower frame cage that will bolt up to the Leveling and Grader Blade frame, then the only thing you will have to figure out is how to mount the engine. Originally Danco had the engine for their Snow Blower/Thrower mounted at the back on the drawbar using from what I can figure out a jack shaft to transfer power from the rear mounted engine to the front mounted blower.
Post pics etc., and document your project as it goes along whether it works or not ... both are useful in developing a good plan.