i read the title and i was like "seriously?"
i applaud your innovation, but i question the design. firstly, freds need to go fast, it seems anti aerodynamic, why not just ride around with a parashoot? you have steep and harsh angles that are just going to suck and hold the air, make it more "aero!" sloping angles, and make it double butted for the weight wennies!
secondly, it looks like a childs seat. where are the seatbelts, do you stuff the child instead, do you bungie them to the back??? i'd like to know whre the children go.
lastly how much weight does it handle, can you put in a couple dumbells and a 15lbs chain lock?(who needs a gym with dumbells on wheels?)it doesn't look to sterdy, maybe put in the L-brackets. and attachet it better to the rear rack, what two clear zip ties? good bye load! also it doesn't look waterproof, or even water ressistant, add ruber o-rings!