Ask The Corps: Polar Fortress
The BoLSCon Narrative Track has shifted and it looks like the Tyranid invasion of Macragge is going to replace Anphelion. Of course I plan to build a Polar Fortress for the final battle! While Dagobah was going to inspire my Anphelion, I am definitely not going to use Hoth for my Polar Fortress inspiration. Hoth was a temporary fortification cut into the ice while the fortresses on Macragge will have been in place for millennia.
Unfortunately, I haven't seen a lot of art on the Polar Fortress. I like the look of the Forge World Imperial Fortress Walls (except for the Cinderella towers) and there is a great rock-fortress in the Black Templar's Codex. We recently featured the Fortress of Eagles in a Field report, but there's not much else I've seen out there for large emplacements.
Got links? Where are the big impressive Space Marine fortifications out there?