Thanks everyone!
Like Kelley pointed out - Skybow's molds of this kit (and others) were recently sold to AFV Club. It's a rare model now. I'm glad I purchased a couple of them, and I think I'll get one more. With AFV Club already producing their own range of Walker BullDogs, I wonder if this one will continue to be produced. A shame as it is excellent.
I used everything that came in the model kit Marty - including the "dreaded"

rubber band track runs. Skybow's polyvinyl tracks are wonderfully detailed and cast, no need to replace them. Being polyvinyl, however, they tend to float above the return rollers. But, if you build the model and set them into place, they will settle properly after a few days.
Stugiiif - there really isn't a weak part about Skybow's kit. I created my own problem by the assembly sequence I chose in mounting the tracks after painting. The suspension components for the Idler and #1 Road Wheel are cast to scale thickness - meaning they're easily bendable. I created a lot of stress on the parts trying to slip the track run back onto the painted model - by starting at the Idler Wheel and working backwards. It warps the alignment of the two wheels, and I had to go back and set them in place with superglue. On the other side, I began fitting the track around the Drive Sprocket and worked forward to the weaker joint at the Idler and #1 Road Wheel - and had no problems.
The second area was setting the alignment of the main gun barrel. Skybow's polyvinyl Mantlet Cover is a nice touch, but in my model, the Collar tended to push the gun barrel off centerline to the left. It's like resin "memory". To counter this little characteristic, I set the gun barrel with 5-minute epoxy, allowing me time to line it up properly and set blocks into place to keep it straight until the epoxy setup. The Mantlet Cover also has casting seams as tough to remove as Tamiya's Dragon Wagon wheels were - but just stick with it and you'll get rid of them. Without - it takes away from the appearance of the Mantlet Cover considerably.
GIB - the Mantlet Cover is cast with the clamps in place - it is one sweet casting. Hats off to Skybow! AFV Club has followed suit and now are selling Mantlet Covers for their line of Walker BullDogs - separately - so you can get one for your model when you decide to build it.