Sinner 4 I love that bike, thinking of a similar build. When I test rode a Cranbrook in WalMart, it seemed realy wobbly, but I think the bar is the culprit there, how's it with the BMX bars? I love BMX bikes, but I'm too big for them nowadays, except fpr the 24" ones.
I bought an old Murray F&F, to build up, but I saw your build and thought I could do something like that, and since it's a 26" I could even get a rack / baskets for a practical bike I can ride daily and quit burning up gas in my car. I also thought about a 24" Cranbrook to cannibalize for parts for my old Murray, but I don't know if the parts would interchange, since the Cranbrook is chinese built, and all metric (Murray frame is from the 80s)
Right now I've got a Roadmaster MTB I'm thinking of taking back, front derailer won't adjust.
Though I could ride it without the gears working in the front, still a six speed (suspesion forks suck, though)