Hello all! It's Resv again, the guy who keeps posting pictures of his crazy Crisis Suit conversions in this thread:
http://www.advancedtautactica.com/viewtopic.php?f=35&t=18243&st=0&sk=t&sd=aExample of what we are making:

I have been asked by many people to share just how the hell I went about making these things. I have been told that I am managing to bring a bit of new life to the old and rather odd Crisis Suit design. I want other people take and run with my concepts to see what the community at large comes up with. I am splitting my tutorial into three parts: 1) Pelvis 2)Torso 3)Posing. This is going to be a long process so stick with me!
Part 1: Pelvis Design Step:1
I know it isn't really a Step 1 but I just wanted to show the tools I use. I picked up the GW flash tool kit and I can't stress how awesome the kit is. The brush is wonderful and the flash tool is brilliant for taking off mold lines or smoothing out burs. You are still going to need a file though. Also, remember that nothing beats a fresh blade on your knife. I use a new blade for each model I convert, it may not seem necessary but I think it helps.
Step:2
You want to cut off the Pelvis Section off of the front torso bit. Make sure to leave that front plate intact, it will serve as a nice visual tie between the torso and the pelvis when we start posing the model. The secret to every good conversion is to make sure that it doesn't look like it has been converted. Having parts that overhang and overlap will smooth out the gaps between parts that were never intended to be glued together.
Step:3
Take the rear torso portion and remove all of the Jet Pack facade bits. Make sure to keep both the vents and the lower armored bits. The lower portion of the jet pack will become our shin guards to glue over the goofy little legs. I keep a plastic bits box on my desk so I have a place to toss all of my clippings. I try to never thrown anything away until I have finished my project, that way I am never hurting for pieces if I need them.
Step:4

Now we get to cut the pelvis portion from the rear torso. Again, we want to make sure that we keep the overhang portion of where the jet pact back plate will match up with.
Step:5
Take the two pelvis portions and glue them together. You will notice that the two pieces will not be flush, you have to choose if you want the center plate to be flush or the inner leg sockets. I chose to have the leg sockets be flush, that way it will provide the most un-interupted surface area for glue between the leg and the pelvis. This picture shows how the pelvis is going to be aligned with the torso. What was once the front of the pelvis is now the bottom, facing downwards, with the flatter and wider part facing upwards to be joined with the torso.
Step:6
Now we have to flesh out the back part of our new pelvis. This is where our extra bits come in handy. We can glue on one of the vents from the Jet Pack facade and line it up and center it on the rear of the pelvis. The vent is a nice piece to use because it has a fair bit of detail to it, so when we put all of the model together there will be small bits of detail hidden away.
Step:7

The final step is to glue on a cover piece to both the bottom of the vent and the bottom of the pelvis. The piece I am using is Dreadnought shoulder armor, these are awesome because the are not only just the right size but you can get them in sets of three from your favorite bits provider.
That's it! Part one is done and soon part two will be underway, we will go over converting the torso.
For now I am calling this thing the Helldiver MkIII, I think it is rather fitting for the concept behind the design. I will go into all the fluff I have come up with later, maybe after the final portion of the tutorial.