Originally Posted by MnHPVA Guy

I went the other way.

I started to built my "Little Genius" as a cargo bike (about a year before the "Big Dummy" was conceived). Before I finished the rack, I realized with a few changes it could temporarily be used as a tandem till my great-grandson got big enough to ride on his own. Seat and cranks take about 5 minutes to remove. Next year it will be completed as a cargo hauler.