So here's how the bastion ended up turning out....
Not exactly what I had in mind, but it fit the bill well enough.
(the building on the left was an earlier de bastion mishap. The walls there were supposed to ornament the building, but in the end I scrapped it because as cool as those cuts are, they were just cool cuts slapped on a box. So I rounded out a base and built up and they'll probably feature as ruin sometime.)
Of course my bastion's still very far from being cleaned up.
The pieces in the middle were another alleged building ornamentation Idea. Cool in theory, but very impractical... I may find a use for them somewhere sometime.
Here we have the aegis defense line (you can also see my DE quad gun, complete with seat):
Here's another look at the quad gun:
And here's the current state of the bastion:
I'm quite pleased with the aegis defense like as is, so I integrated that in to the bastion as well.
Of course, It's still all rough work right now.