Dan Jose,
Pardon my design rambling, I just love to daydream these things. but I think this could be done fairly 'cheap' for a one-off custom.
I'm not sure where your 'vision' is, size-wise with this bike, but perhaps consider this:
Your sketch shows rather short seat stays and chain stays, these could be borrowed directly from a Schwinn OCC chopper or even a Jesse James bike. They can be really cheaply on Craigslist/eBay. This is the platform Kenny Prather uses on his bikes and they are WAY cool!
For the front frame section, I'm seeing either a 'Dyno' style frame or even an Electra Flying Sue/Punk. All you need is a set of truss rods (I don't see a springer in your drawing like Dingo does :roll: :wink: )
The curvy down tube would have to be custom fabricated (you could move the BB forward just enough to use a chainguard from a 26" bike and to look like you stretched it out a little). The handlebars may be custom too, unless you can find a set of 'longhorns'.
You could end up running a FAT 20 x 4.25 in the rear and a 24 x 3 or even a FATTER 24 x 4.25 (both tires are available at ChoppersUS) combo. For that fat a front tire, you could always widen a Schwinn-type springer with some spacers and longer bolts to keep the 'vintage cruiser motorcycle' look I see with this design.
The seat is nothing unusual.
For fenders, consider a set of fiberglass units from these guys:
http://stores.ebay.com/WICKED-CARTS
Being fiberglass, they could be widened fairly easily to accomodate those FAT tires.
Headlight could be made from a mid-50's VW front fender mounted turn signal w/a clear lens. The tail light also from a mid-50's
VW beetle unit (can you tell I'm a V-dub nut too?). Pick up a Hot VW magazine there's tons of re-pop vendors for them.
The rear rack may be a challenge, what about two halves from a women's tank resting on top of the rear fender? Space them apart and add some sheet metal to the 'front', 'bottom' and 'rear' and it would form a 'bucket' to haul stuff in. (a hinged lid would be cool too) some small diameter steel rod could be bent to create the rails and possibly function as a 'handle' if you added a top.
Add a full cover chainguard (saw a pic of a cool one on an excercise bike today), some Torrington pedals and you'd be pretty close to your sketch.
Again, just 'brainstorm' designing here. :mrgreen:
Cheers!
Dr. T
