So, credit goes to the sharp-witted Jochmann for the first correct guess: this is going to count as a sniper drone!
The clincher will be the final addition of a rifle from Paulson
to the top side of the model, but it will be some time before I am ready for that step. In the meantime, here is the step-by-step build process:
The first cuts: the tentacles come off two spore mines, and all imperial iconagraphy and rivets come off.
The next steps are putting things together. Each metal spore mine piece is attached to the torso/pauldron sockets with a wad of green stuff and superglue. Here is the spore mine ready to go into the pauldron, the pauldron/spores ready to attach to the torso, and the all the spore mines attached to the torso. Make sure you have the back of the space amrine torso facing up, so attaching the gun will be easier later.
Next the tyranid claws and tail go on. I attach them to a wad of greenstuff, tail pointing straight back, and talons coming down at angles.
Finally, I texture the large area of greenstuff using the edge of a paperclip to give it a ripple effect, so that it looks a bit like cloth.
Afterwards, I drill a hole for the flight stand near the belt buckle on the torso.
The rifle is fitted to the top of the model, after some slight modifications. The handgrip and magazine are removed, and the top/back of the space marine torso is modified to receive the rifle.
For those interested, I am working on fluff/background for these guys as well. I'm calling them the Gepidi.
My first draft has them coming from a low-gravity world, where they float around using natural buoyancy and air jets. Their world is prone to strong, unpredictable wind storms, and the Gepidi have evolved excellent reflexes for navigating them. Off-world, they spend much of their time in Air Caste orbital cities, where they enjoy an environment similar to their homeworld. In high-gravity environments they use gravitic harnesses designed by the Earth Caste, which augment their natural buoyancy and agility. Their naturally keen sense of depth-perception and three-dimensional space makes them very dextrous, and thus fine pilots and snipers. However, they see in a limited spectrum of light that is usually not abundant on other planets. In order to take advantage of their skills, they require support from a spotter to designate and illuminate targets. These spotters usually double as markerlight bearers, since the two tasks are virtually identical.