Ok, maybe not that extreme, but he new Ratkin Death Engine model is shipping for Kings of War.
Next, if you want to make the spewer (or magnetize it to switch versions) then you need to assemble the guns by gluing the barrels to their base. (RDE14 and RDE6). These are aligned so the little tabs on the barrels point down (toward the blank side of the base).
Then the top is glued in place. There are two cross bars that match the collar / brace on the nightmare. Also, the rear supports attach to the barrel underneath the ladder.
The front crosspiece fits behind the collar, and on top of the belt.
When I glued the tracks into place, the chassis seemed to be a bit uneven - I'm not sure if something was actually wrong or it was designed with a slight list - though I actually like it and think it fits Ratkin better.Next glue the crew in place. There are small holes and marks to guide where to attach these.
Were I to do it again, I would wait to glue the control sticks to his arm until this step, to get them to align better.
The last part is then the weapon option - either the guns for the spewer, or the grinder for the Impaler. On the bottom of each are a pair of small, square holes. These fit onto a pair of pins on the tank top.
For the Impaler, the grinder fits on in the same place and way as the guns did.
If you want to magnetize the weapon options, it looks to be really easy - magnets onto the back of the nightmare, and then either corresponding magnets (stronger) or thin sheets of magnetic material (roofing tin, or flex steel).
And that is it. a very cool model helping to fill out the range. The kit looks much more imposing than it actually is IF you have any experience building models (I would not recommend it to anyone who hasn't put together lots of models already).
Because it is all fun and games . . .