For a "box", I used the plastic case from an old iMac computer!



There are some #8 machine screws, with fender washers, holding the case to the plywood:



There is a piece of foam poster board between the plastic case and the plywood.




So this is my new Utility Bike. The plywood sandwich may look ugly, but the lower shelf can carry SLA batteries (sealed, lead acid, 12 volt).

The iMac plastic case is almost just as good as the fiberglass fairings which we showed at the start of this thread, maybe better, because I couldn't make the fiberglass translucent like that. Note the similarity?

The iMac case is 15 inches long, 15 inches wide, and 15 inches high. The overall length is now 77 inches , or six foot five.

I use this bike for hauling gravel, to improve off-road bicycle trails.