Looks like a very good plow, not to heavy or light, needs a cutting edge from the looks of it.
I think the fork frame is a good foundation to work off of. I'm sure you wouldn't do anything to render the fork unusable.
I was seriously considering doing the same thing with my plow/ fork frame but instead went with a tractor frame mount. At first I was gonna lift it with the loader, but just went and made a simple lift.
The whole set up was so stupid easy, that even I could do it.
I had the truck side under carriage, just welded two 1/2"-5/8" plates on in a strategic position, and bolted it to all existing holes in my frame. Stupid easy and wicked strong. The undercarriage stays on and does not interfere with loader install. The lift was also equally simple. Use loader stick for plows 4 way action.
Not trying to change your mind, but have you thought about frame mount?
Some pictures of the evolution of my thought process over a 2-3 month period. Oh yeah this plow still couples with my QH and is pretty efficient on the rear, when used with the loader on front.
JB.