Startup: Even Better Than Recycling

OK I’m confused… did he not drink the beer, thus leaving him skilled and clear-headed enough to build it? Or did he, in fact, drink the beer (and it’s brothers) thus giving him the correct combination of bored and intoxicated to think, “Hey, with a little farting around, I bet I could make this into a passable replica of a Kurtis-Kraft 1946 Offy Midget.”