i would imagine you could do either way. my husband bought me a 'craft/sewing table' that has a spot in it that drops for a machine. well, it drops a little too much for my machine, so we had some 2x8 we weren't using & he cut a couple lengths for the spot, to raise up my machine. we thought i'd need 2, but one does fine. anyway, my point is, depending on your machine you currently have and the machine you'd be getting, if they're close to the same size you could have him cut it to fit both. if you're not sure, or don't think that'd work, or can't make it adjustable at all, i'd just wait and see what you get...but if they're too dissimilar, you may not be able to have him cut a one-size-hole-for-both-machines, anyway. i think it's really swell that he's making a table for you!