You know what? I have! It's geared nicely for trail riding - super granny gear.
But have a look at the rear derailleur. See how low to the ground it is? I didn't consider that, so my first trail ride was my only trail ride because I tore it off when it hit a rock!
Since then, town riding only. Maybe a few flat dirt trails.
Here it is with the rat trap on the back. Doubles as a rear fender (coroplast inside the frame). It accentuates the lines of the bike perfectly.
I also welded gusset plates on the seat back. It had been bent back from the previous rider (you can really put a lot of force on the pedals when there's something against your back).