I admit, noooot really interested in short-changing Belegar/our job in terms of actions. We've been told repeatedly that 2 is the minimum, and 2-4 is expected. We didn't even spend very many actions this turn on our job (2)! Yes, we invested a bunch of favors of our own, but so did Belegar. Belegar funded the project, and Belegar covered many of the promises necessary to get everyone down here (hence why getting anyone but Algard would have been free).
I figure that we've gotten extremely lucky in our rolls on the tower so far: why not go for broke, and make sure we have a 24/7 death tower that can destroy armies in a 360 degree angle around it? The ultimate defence for essentially any overland assault.