I'm pretty sure I'm not the only one here who would find it cool, so I figured I'd share this.
On the way into the grocery store I saw this bike in the rack. At first glance I thought it was one of the 'Dutch' cargo bikes available in a place downtown here. On second look, I realised it actually had a motor-compatible frame, so I stopped to check it out. I've looked at those bikes and many don't have the frame for a CG/HT to go into easily.
Something about it didn't seem right. It hit me after a few seconds, this bike was converted.
I stopped and took some pics, (they're attached) and checked out the website. It's a kit called the FreeRadical X1 from a company called Xtracycle. The extention frame bolts into the dropouts, and at the chainstay bridge. A pic of the frame itself is under the 'Details' tab. Their sidecar kit that can just bolt on to it looks pretty good too.
The bike was gone by the time we got out of there, so I didn't get a chance to find it's rider. I'll be keeping an eye out for it though, it's got to be in the neighbourhood somewhere.
It's not a project I can afford right now, but it has me thinking about it.