Looking to build a low budget vacuum table, will be using it for 0.125" aluminum and plastics, mostly engraving very little contour end milling. The table itself is easy enough to design and build I need help with choosing a vacuum pump. I'm pretty sure a 9 cfm 3/4 hp is way too big for my applications. Table size would roughly be 13x13. Anyone have any input on what I should look into?