I know I'm late on the mark but whatever.
When I got protector of stone and pohatu I had the same reaction as everyone for the combo model "that's it? Really?". So just using those 2 sets I upgraded pohatu into this new powered up form. Only using parts from the sets only not including the skull scorpions.
The stormerrangs on his shoulders can turn to be sand turrets and propeller blades for flight. inspired by the propeller hands pohatu phantoka (I think that was the year. I stop buying sets after the mahri year.)
Just a shot of the leftover parts. I switched ikimus and protector of stone eyes so they look better.
All I did to korgot was replace her lower legs and arms, add some pieces so what I geuss were her breast were now on her chest, and add the extra studs as decor.