Similar to what @geodave just suggested, almost any of the cantilevered designs out there can be converted readily – and IMO improved – to a “4 leg design”. I had two slightly-modified ERC TimSav machines (a “minimalist” cantilevered design) set up for my TimSavX2 hot-wire machine – which I’ve since dismantled… so I took the two machines, mirrored them, and set them up with a shared gantry. Series connect the axis with two motors and you’ve now got your 4-legged machine…
I’ve been working on a new Z-axis and a laser module is missing in this photo…
– David