KevinP::Mecha
Walking machines, powered suits, etc.
  
I don't think the original model was supposed to be a diving suit, but that's what I made it into. I scratchbuilt the "hands" and also a head to go inside. Patlabor Brocken Type
  SF3D Fireball, with a few extra details.
You and Whose Army?
A Games Workshop titan, modified to be a little more "realistic". The figure is a 5mm(?) soldier, looking up at the titan.
 
  Games Workshop Sentinel
which is suspiciously like the Star Wars™ ATST.
Xabungle mechas. From left to right: Trad II, Gallop & Crab types.
These are all about 60mm tall. The Crab Type had it's picture published in the now defunct magazine Space Voyager several years ago.