After seeing icanfly's Mainframe, I was inspired to push up this small project...This Mainframe is like legends scale on a tad bigger side.
He transforms into a Cybertronian open cockpit, all-terrain observation vehicle. I figured like all the G1 Ark crew, if he was to have been on Earth, he would have been a truck, or some sort of 4x4 vehicle(as G1 Bots had vehicular modes that were not exactly pointing to their bot's function...ie Wheeljack was a sports car even though he was a scientist, or both sideswipe and sunstreaker were sports cars even though they were combatants and warriors). Anyway Enjoy:

 

Dude, I like it! Where'd the cockpit come from?

 

Is that an old Zoids cockpit? Nice!  

 

Looking awesome...

 

Thanks bro! Johnbonhamatron guessed it correctly as a Zoids cockpit from the older series.

Thanks mate, and Great eye  

Thanks mate!

Parts list:
Head: Scratch built
Body: Power Core Commander Smolder's Ax mini-con
Arms & Legs(with waist/crotch and shoulders): Legends Warpath
Custom Chestplate, and Zoids Cockpit.

 

Nice job

 

Great work, as always mate  

 

Nice work

 

Thanks bro!

Hey thanks! And Thanks for being the push to do this little guy  

 

No worries. Your head looks more accurate than mine too, I dont fully trust my scratch-build skills yet.

 

I understand how you feel...too me a bit to start doing that as well...keep it up bro.