I'd have personally thought that, without allies to man it, the fortress would be a few too many points spent in deathwing.
You get the most value out of it with a squad on every battlement, and that is a HUGE chunk of any deathwing army. You couldn't use allies in the tourney so I'd have considered swapping out a DWT squad for some scouts or something to fire the weapons. Still keep one squad with TDA in there to do that crucial objective grab or counter charge.
Again, I'm with you if there's allied guard in there, and there are still the other advantages it brings, I just wouldn't have spent that many points on it myself.
Seems to have worked alright for you though.



