My first machine was built from a rockcliff. I'm currently contemplating on building a 2nd machine using a flying gantry, designing it as I go along. I was thinking of making it from a mix of steel (square tubing) and mdf wood. Table size about 1000mmx500mm I do have some questions though:

(1) I've got hobbycnc controller board with 305oz steppers from the first machine. Will they be good enough to drive a flying gantry using only 1 screw?
(2) Any reason why I shouldn't be using steel and mdf together?
(3) Any other tips and comments ?

Thanks,
Tom