look up 34R. theyre doing it for freestyle stuff.KHE Affix. Bushing BB system. really only for flatland, but i think there were a few other companies experimenting with a similar configuration for other bmx applications.
i had a sadio plastic BB on my flat bike and absolutely hated it (so much moar friction), but it didnt weigh anything and kept the cranks in place.. so i guess i shouldnt have hated it..?
i have never seen that macneil one though, and im glad i havent (until now). id sure hope its a joke!