Thats probably about the only thing i would use it for i would think. I have been reading threads with the one you made and i have already contacted surplus center to see what they would have as far as motors. Did you buy a 3 point adapter plate or make that yourself as well? i dont have a cutter yet, and i have started looking at those as well, any certain models i would be better off with. (heavier metal maybe ect..? )
I have the light duty king kutter 5' with 40 hp gear box. The fellow i got it from made it fit a skidsteer, it no longer has the 3 pt hitch.
I would like to go with a 6' wide 60 hp gear box (has better tapered bearing as opposed to ball, and a heavier blade holder as I reinforced the 1/4" thick pan that holds the blades on mine) and a heavier deck. I ran 3/8 by 6 (memory?) the full length of my deck to stiffen it, and made a whole new holder for the front wheel. The sides also take quite a thashing where the blades throw debris at the left fron and right rear side. Should be stronger there to.
There are many brands of cutter and I'm sure some are heavier then others. The gear box has not been much trouble, the hyd drive is much easier then a direct pto drive on the gears. The deck however can take alot of abuse especially if you mow on rought ground. My King Kutter is only 1/8" thick top and sides and thats marginal.
The good part about King Kutter is they use vary common parts used by several other brands and there is a guy on ebay that sell complete new gear boxes for 200 to 300, blades and other parts are cheap. If you search cutter gear box on there you will find him , I'd recommend staying within those brands.
I just think you can convert a cutter to skidsteer for 1/2 to 2/3 of the price of the adapter. Unless you want it to run a pto auger or other tractor implement.
Ken