The swing motor will be fine, Deere had them on a few of their models so don't worry about that. These units were used hard on crawlers, and will stand the abuse you put to them. I'm not sure what your concern is about open center hyd. is, all that happens is oil comes from the pump ,goes to the valve ,leaves the valve ,and returns to a reservoir. You will need a hyd. tank at least as big as the gpm of your pump and a pto shaft mounted hyd pump around 20-25 gpm. Case used open center hyd. systems on 580's for years and guys love em. Don't forget to install a filter in the system also. Surplus Center has alot of the hyd. things that you will need ,and you will need a few,pump,tank, filter base and filter,relief valve, and maybe a hose or two. Just some things to keep in mind! Portsmouth here,where in Ohio are you?