I like the wheels as well, for that style of bike. A cafe bike would be really hard to make from that platform, due to the forward controls, tank shape and wheel size.
I like the first bobber, but I would add a rear fender. I'd likely chop the stock rear fender until it stops at the top of the rear tire, and place the lights and plate there. The rat bike in the last vid looks like a spine pounder.
I think I'd hard-tail the frame and create a sprung seat from a mountain bike shock. The problem with coil sprung seats is that they sway in corners, and that would be unnerving to me.
Whatver you decide to do, please take many pics and start a new thread on it.