I have one of those too! Same cabinet and all. I added a shelf and doors to the cabinet. I have the original vise, drawbar, and outboard overarm support. That extra overarm support really makes a big difference in the rigidity of the machine. Isuggest that you make one for your mill. When those things appear on ebay they run 250 -275!
Same pricing for the original vise. Looking at the pictures, i could not tell if the power feed kick out piece is there or not. That piece is hard to come by. If you dont have that piece, I can take a picture of it for you.
I also have 7/8 and 1" mandrels. The one inch cutters seem to be more plentiful.
The spindle is MT2. I have a mt2 holder for half inch and three quarter slitting saws. They work ok for very light cuts but i use my larger vertical for anything serious.
Dont overlook the fact that the little mill has a back gear. You need a tool (piece of flat stock 50 thou or so thick, ahalf inch wide and about 6 inches long - with a 45 degree bend about 1 inch fom the end) to reach in on the right side of the spindle to pull the pin. You cannot see it easily.
Good luck with the little mill. I love mine