But then I ran across this thread on the Work In Progress forum. I contacted the poster and asked if I could use his very cool scratchbuild as the basis for my own Thunderhawk, which he generously agreed to. Using that and the design aesthetic of the current generation of Space Marine aircraft, I gave it a shot.
After several days' effort, I present to you, the Javelin-pattern ThunderSquak heavy dropship! It isn't ready for printing quite yet, but hopefully I'll have it up on Shapeways in day or two. There will also be a vehicle transporter variant coming in the near future.
UPDATE: Here are a couple of pics of the Transporter variant. The gantry clamps underneath the hull come as separate pieces, in case the modeler doesn't want to use them.