As far as I can recall they put out only two episodes of the Variety show on DVD (I bought a copy). How did you manage to see all of them and how can I get the rest of the episodes?
Yes, the dunk tank was a family endeavour. Regarding the go-karts, Peter built one entirely by himself in "The Undergrdauate" (season 2) as well as "My Brother's Keeper" (season 5), but, he Greg and Bobby did build a third one together in "Love and The Older Man" (season 4).
All this, but he can't fix a freakin' bike?