In assuming ssqa is expensive, I do fancy the idea of self build, I am capable of such things. I don't have a secondary hydraulic take off though so that's something I'd need advice on, ie where to tap into the original system. There I a tap under the front of the seat with a blanking plug, I assume there?
You can, it has to be real low and attached in front of and behind the axle
There was a stock kit to run a snowblower off the front years ago.
As far as a front three point you would have to make it up as Kubota never had that option for these models.