Heisler Rear Truck w/ variations

Spent some time on the CAD system and decided to put in some pieces of the truck. The book in which I am working through to make the Heisler is by Kozo Hiraoka and the Heisler he made is of the two truck version. And that's what I plan on building; however, a few of my train pals keep telling me to make the three truck version. I keep putting up all kinds of lame excuses for not doing it, when in fact the only real reason is that I don't want to spend the extra time in doing a third truck. There are a couple of ways of putting a third truck in line and I did not like the idea of a transfer case in front of the rear truck. After looking at Kozo's drawings, it looks like there will be enough room to enlarge the current gearbox design just about a half inch on the width. This will allow a second "ring gear" and a second pinion gear to come out the rear of the case and run straight back to the front axle of the tender truck. The second ring gear would float on a needle bearing because it has to turn in the opposite direction as the axle. The more I tossed this gearbox arrangement around, the more I liked it. The second set of gears in the box helps stablize the input shaft from pushing to one side and with that stabilization you get reduced friction.

So, I included a couple of screen shots from my CAD program. You can see in the second pic that I added the second set of gears but left the original size of the gearcase intact.

Enjoy.