Originally Posted by
itsajustme
The problem is that since the boom adjustment follows the ~26" arc shortening it horizontally entails raising it vertically. In the photo of your first conversion the crank bracket is already probably too high for a cruiser bike with a nonaggressive seat recline. Shortening it more will not only raise it even higher, but also push the weight distribution further rearward.
The Mini's frame is shorter than that of the Front Suspension. You'd be lengthening the boom, not shortening it, compared to the setup in the picture.
I can't hazard a guess at your idea of messing with where to install the wheel. That's above my pay grade, to use a currently popular expression. You may want to ask John Tolhurst or Doug Burton on the Yahoo Groups about that.