After completing the bunkers (apart from one that suffered a mishap and will need some extra work), I ventured into the loft to dog out the others.
The first release was the Firebase. A nifty little landing pad.
I never picked up the Bastion for some reason, but the Battle Bunker was the one I bought next.
Some White Dwarf insert barricades that came out at the same time as the Storm of Vengeance campaign pack.
The Imperial Guard Command Tower.
The power station from Storm of Vengeance.
The Orks even got in on the action but I never purchased this one either.
And of course, some people are talented enough to improve on the original!