My dad has one, it uses a Power steering pump and a set of Farmall Cub loader valves for power. The frame is bolted to the torque tube - if you do this bolt to the torque tube, the front engine plate (there are a set of fore/aft holes to use) and the fender tubes, to help distribute the load. The torque tube won't break unless you're going way fast and hit something. This rig has been on the tractor for 15 years and we use it to move anything the tractor can move.
Be aware that carrying the blade out front puts a tremendous load on the axle. You will be replacing the bearings, spindle bushings, and probably the axle pivot bushing.
That's why a mid-mount or rear-mount blade is better - the load goes to the heavy bearings in th final drives.
Here's an idea - find an old cultivator set and mount the blade to the frame, just in front of the wheels.