...not like a 40k FORTRESS fortress which would like cover a continent, just a little chibi-size field fortress, for getting a cup of recaf and iho stick between skirmishes. comes with a convenient six-pack holder...

A thematic objective marker for epic. Modeled on the fortress in the pictures. Not sure who made the original model but i've liked it for quite a while (thumbs up sir/madam).
Just basic extrusions, low detail, prints in one piece, relies on paint to add character.

The banner slots into the hole on the top of the structure. Print out one for each of your chapters and paint their specific icon on it. you will probably need to sand down the banner stick.
If you paint the main structure in neutral tones you can swap in your chapter banner without breaking theme. Do not glue in the banners if you want to swap them obviously.

to use it thematically the fortress sits on the back edge (blitz marker) and has twp outlying small buildings/bunkers/stockpiles/etc on the opponent's half (take and hold markers).

note: this model is going to be quite high for an objective marker, with about the same footprint as the chapel-barracks, but smaller than the stronghold.

the banner is available on the chapel-barracks object...
http://www.thingiverse.com/thing:1860143

for the gun turrets i will be printing out the sponsons objects from here...
http://www.thingiverse.com/thing:619998
(predator destructor heavy bolter by fractanoise)
(scaled up to 1.2)