Sweeeet metal balls of Zeon~!!!! That is one MONSTER! LOL. This work was done way back in 2005, but I only came across it recently. In terms of sheer detail and scale for a TF kitbash, this one takes the cake! Woot!
It's done by Menchoy from Sector70, a kitbashing site. I'm not sure if this fella still has a current blog or site of his own, but if anybody knows feel free to tell me. You know what else is crazy?? This behemoth was built using Zoids and TF toys, kitbashed together. And they can STILL transform! Wow. Imagine all the work that went into that. Here's a look: