Thanks for the welcome, guys!
Well, after a week of debating with the wife and kiddos, we decided it would be better to put a kit on a production bike, rather then trying to DIY a bike, then DIY a motor kit onto it. I've started playing with an old mountain bike I had in the back yard. The problem with Mountain bikes, for me, is that after hurting my back at work a couple of years ago, I sometimes have a hard time stooping down, so the typical bent-over position of most mountain bikes can get painful. Then I got to reading about Comfort bikes, and wondered what it would be like if I just put BMX bars on my mountain bike.
Here's the results of that idea (Can you tell I like it?)
I'm not sure about the bike, though. It took several years sitting in the backyard in the rain and was pretty tore up. I've started playing with it, trying to get it mechanically sound again, but if I'm not confident in it as a regular bicycle by next week, then I'll probably just buy a K-Mart Special bike and motorized it, instead. (After installing BMX bars on it, of course.)