Here's a chassis loosely based on the classic Emott Batwinder. I built it a few years ago and it's been in storage ever since:
Although it closely resembles an Emott Batwinder, it is not a replica.
This chassis, a mix of old and new, would be good for the 1st race held in January. It has a motorbox, a design element which was falling out of favor, and a plumber hinge mounted on the drop arm, a very recent innovation. The drop arm itself fits a Cox guide, soon to be replaced by the low profile Jet Flag.
With some detail work and a Kean Kan style motor, this chassis should work out well.