he'll have to make a tray or box underneat to hold the machine
when he cuts out the hole for the machine be sure to leave room to get your hand to the on/off and anything else you made need to fiddle with.
soon after my hudband got my homemade table just like i wanted it (lots of changing my mind) i got a new machine and it won't fit, so now i'm back to using my extension! LOL i don't blame him but it's hard to know just how you need it to be untill you've tried it out, then you know what needs to be changed or what you wish you'dve asked for in the first place.