You can see here, the torso ceiling section that fits into the carapace, that I finished earlier in the project.
Build-wise, the carapace wasn't that tricky; I had to trim down one of the sides that sits against the torso, due to one of the torso sections not being entirely straight - but the part is not visible when assembled. I also added the hatches to the carapace that fit over the side compartments of the torso - meaning that those interiors are now visible. They were a little awkward to add to ensure that they were flush to the torso, but also had a strong join on the carapace - in the end I had to greenstuff a few gaps where they meet the carapace, but they look seamless now from the exterior.
The torso ceiling fit in easily and is yet another example of a lot of obscured detail (I still cant get over how much there is on this thing).
I have checked that carapace fits nicely with the completed parts of the Warhound - and it does - but I am going to refrain from posting any full pictures until it is done now.