it would require vastly less in the way of resources than her original planning... all of the iron stores perhaps but I think less... You would not have to make the walls thick to withstand the explosion of propellant. This could lead to smaller, more portable units like wagon mounted multi-cannon ballistas or shoulder fired weapons (much like modern bazookas and rocket launchers)

After the war is over and you have cleanup to do... into the ways with it or off a skimming platform. maybe there is a bottom to the vastness of the skimming world and it is littered with all the cuendillar that has been created over the many turnings of the wheel. I imagine that this is not the only turning where cuendillar was made other than the AOL and I would think that it would accumulate, after all it cant be destroyed. (easily or by known methods)