homebuilts

I am new to the list and had some questions.
Met a couple of bent riders at Oshkosh, Wisc. airshow a couple weeks ago.
One mans name was Alex and his homebuilt black and yellow bike was named
"afterburn". Another guy built his out of muffler tubing, and it was white,
however I didn't get his name.
Was wondering if anyone knew who I am talking about?
Dennis