thanks again for the help, starting to make my way around this now. having a bit of trouble snapping 2 pieces of the box section to it's self, but i am finding the by placing measure lines i can snap to them then just delete them.. same goes for scaling.. i'm measuring out the size i want and then snapping the item to the line to get the right size.

i am struggling at the moment to find a source for sbr16 rails and bearings and also a suitable ball screw assembly that i can make to size.