What are you looking for? tutorials on how to scratch build them or kitbash?
As So far the problems I can see are that if your looking for ways to kitbash then its more about the pieces you have available and how to use them together, so a tutorial would be rather pointless.
Scratchbuilding however, your more likely to find some relevant stuff here
imo. Look at scratchbuilt stompas. plenty of tutorials about those, that should give a little inspiration
A quick youtube and:
http://www.youtube.com/watch?v=Ap1rr7ZFAH0
http://www.youtube.com/watch?v=um-OQpPFzIA
But
imo, I suggest you just breakout the kit box and find a few key pieces you like (say a big robotic arm from
GK dreadknight) then start building around/based off that.