Assuming that for now cutting sheet goods is your objective, and the clamping versatility of an MFT style top can wait...
Do you have a track saw? If not then you could first try a scaled up version of Dan Pattison's crosscut jig: search "circular-saw-cross-cut-jig-pt1".
If you have a track saw...
You may find helpful the information Lee Valley provides about maximizing pull from a magnet. I can't post the link, so go to the page for Rare-Earth Circular Magnets and click on the "Instr" link in the price box.