Now for tonight's update!!!!
I now have a functional chassis!
WhooooHoooo!!!!
Everything "seems" to act as it should, gear mesh is nice and smooth, the tires spin in the correct direction to support the "turn right" racing and guide engagement appears to be good. :)
No idea what anyone else's car weighs - but mine is a TANK!!! For grins - I threw mine on the scale (chassis with body sitting on it) and she is currently at - 78.3 grams! I still have to add interior, roll bar, and body mount(s), etc, which I am betting will have her pushing 100 grams when everything is said and done!
But the good news is, with my highway gears (2.60 to 1) and heavy weight, and non-sticky factory Carrera Go rubber, handling should be fairly predictable. :D
Here are a couple progress shots...
From the top:

(yeah - I probably WAY over built it - but had visions of how violent the wrecks get with my Scalextric Mini get - and didn't want her turning into a pretzel after the first minor off)
From the bottom:

With the body just sitting on it:

(please ignore the fish eyes in the paint - I was rushing to get some kind of color on it before shipping it out this week and didn't have time to wait on a primer coat, etc)
Next up - is body mount(s), fabbing a grill, wind screen(?) and interior. Hopefully with having the extra week, I will be able to sneak away to the local track to confirm that it will be a smooth, easy driving machine.
On a side note... As a first time participant in one of these proxies - this has been a hoot! I found that it wasn't as easy as I thought it was going to be - but have to say seeing the wheels spinning tonight was pretty darn satisfying after having to scrap the first chassis attempt (after numerous - hmmmm - if I do this - maybe... type boondoggles)
To that end, I think I may add a chassis jig to my wish list now, as having one of those, would have made it a WHOLE lot easier to keep things flat/straight/square/parallel - and hopefully, this won't be the last of these proxies! :D