The original intent...
So, what looked like a simple "stick Sidorak's torso on Nidhiki's legs" job became quite a bit more. The whole bottom half had to be beefed up and redesigned, and here's what I came up with...
As you can see, the basic Nidhiki legs set is almost gone and has been replaced with more robust legs and a beefed up support structure. About the only thing left of the original design are the placement of the frame and swivel sockets. Extra articulation has also been added to the neck for that sort of "hunching" posture he has in the drawing.
I think the hardest part was finding enough of the "Republic Red" pieces to make him look whole. The original Bionicle red just doesn't jive.
Once I got the legs squared away I realized I needed an abdomen, so I managed to cobble one together out of much of Toa Hordika Vakama :P
"DAMN YOU ROODAKA!!!!!!!"
So there you have it. Once again, the best part was the challenge of taking a very organic original drawing and translating it back to LEGO form. Personally I think he turned out well