Hi Aiden
Welcome to the forum, you have come to the right place, the guys here will assist if you do decide to build a machine. First step is to have a look @ the build logs and get a feel for what is involved, then when you have decided on the size and configuration knock up your design in sketchup or similar and offer it up for comments from the forum members, cheapest option is steel frame so if you can turn your hand to welding this helps.
Good luck
Mike