Yes it is rather heavy, it weighs over 2000KG, and my fork lift had problems lifting it.
Wont be converting it to run from Mach 3, according to the guy who sold it me, it is in working order including the controller, so will be using it as is for the moment, and if i do retrofit it, i will put a proper cnc controller and large AC servos on it all closed loop.
I have my myford 280 in bits to start a conversion on that; that will be all servos and not sure if i should put a 2 axis CNC controller on it or do it for mach 3, yet, but it looks like i will stick with the controller because of the closed loop and convenience of not having it connected to a pc.