It looks pretty cool, but I'm going to be honest, if you plan on playing with this mini much you're going to probably want to dial back the protuberances.
That purity seal on the missile launcher arm is going to snap off quickly while moving or in transport/general use. If you had made it out of something a little sturdier such as thin aluminum then you'd only have to worry about it popping off where it was attached in one piece. As it sits, it'll likely break off somewhere around where it bends underneath the missile launcher arm.
Not trying to sound overly critical, I'm just looking at this from a general use perspective. The actual seal and blowing effect you've pulled off is awesome I'll note, just hate to see something that looks that cool get broken when you bump it or accidentally drop the mini. :(
I think keeping the
DA Icon on top of the sarcophagus is a good idea. I like it up there and it'll look cool on the final product. I would leave the swooping hawk wings off for two reasons. One: More fiddly bits to get knocked off of the mini during general use. Two: They look elven/alien, since they come from an Eldar model, and are not man-made looking.
Overall I love the bits added on to the mini so far. The etched brass, the purity seal on the right side, and banner on the left side all look good. I would consider lowering the banner on the left front so it's attached just below the scanner lenses and sensor array at the top left of the shoulder. Just a suggestion there.
Hope that helps, and I look forward to seeing the final product soon if nothing else! Take it easy for now.
-Red__Thirst-