This is my entry in Swash Buckler's Rebel Tank Contest.
Sorry about the wheels---this is my best idea. It's much smaller than the mech used in the clone wars. And I have to say I haven't seen any REALLY custom (not the modified official)juggernaut in this site...
About this creation
Two rebel drivers are essential to control the vehicle---and of course two other man required to control the weapons: the turrets, the missile launchers, and the othre weapons.
The weapons are very important: two antipersonel repeater laser against stormtroopers, missile launchers (x2) against AT-STs and other walkers and two turrets on the top to provide covering fire to the rebel troops.
This looks great! I love the detail you put into it. I'd have to say the wheels are the weakest part (I'm sure you heard that enough). I'd say go to Bricklink.com and order some wheels (under parts, Clone Turbo Tank).