Back when I was a kid, I made a four-tom drumkit out of a normal kit by sawing all the toms in half and making them shallow single-headed drums :)

I would love to have a 'pancake' kit with all the drums double-headed but shallow. Maybe someday I'll try to get that made. The article suggests you could simply do that: everything gets the same very shallow drum depth, like a kit composed of snares without snare wires.