Crazy Horse has been doing some research, and what I've found is some of us have been using the worksman industrial newspaper boy bike & some have been using the Husky industrial bike for our board track racer style tribute bikes.
Such as Deuce Motor Bicycles in Burien, Washington and another builder in California.
Deuce is very busy right now and will not have any bikes for sell anytime in the near future.
One of Deuce's builds a Cyclone board track racer was sold to a guy in Michigan June 2008 which is shown on Deuce's website of previous builds, his builds are amazing!
Deuce sell's his rolling chassis for $900 bucks ouch! Which includes frame, tank, forks, & clincher wheels.
Deuce sells complete bikes $1800.00 yes One Thousand Eight Hundred bucks + shipping from Washington State.
While expensive they have an authentic original look which derringer board trackers dont and those derringer bikes sell for about you ready $3800.00 bucks ouch ouch.
Builder in California who might sell tank & frames only under $500 bucks ouch again!
It appears that Deuce & California builder are using Worksman or Husky frames, looks like they remove the down tube which is tube from the head tube to the bottom bracket ( explanation for the newby ), then replace it with single loop tube giving frame board track racer look.
I myself have four current builds underway 1-Simpson Model 10, 1-Worksman Industrial Newspaperboy, & 2-Firebikes Board Track Racer's. I'll be using ezmotors on my builds with faux brackets to get more of vintage engine look.
Will post pic's as builds progress.
Peace Crazy Horse aka Crazy Indian Joe The Tower Crane Operator!