I think that 1/16 scale is the perfect medium for the RC tanks. The affordable price (I started out with HL tanks when the first came out), ability to fine detail & customize (from PE to home-made features) and more importantly for me portability (they travel well and I have even flown to Europe with them). I looked at 1/6 scale but just having one on the workbench took up almost the whole bench...LOL. Plus IR battling with them is very rare and the paintball tanks have very little detail. I have seen some very fine large scale tanks but very few were RC.
Now if you built a tank that you could sit inside and drive....Hmmmmm.... Bob, thecommandernj
I have seen some nice mini tanks on YouTube.
http://www.youtube.com/watch?v=4swerl3pSpo
http://www.youtube.com/watch?v=kxxrOY3r89M
or a little smaller....you know...more portable
http://www.youtube.com/watch?v=WzzRx5Z9uLc