I'm not sure yet. Much of this depends on the modding ability of tactics and the time I'll have at my disposal, but I reckon it's going to be larger than FoT, more like Fallout 2. Also, it'll be a lot more story-based.
I basically want to make a mod set just before the Great war, In China, Alaska and some US cities. I haven't really figured out an ending for it yet, suggestions are welcome. I first thought about making it for Fallout 2, but the whole war thing suits Tactics more. Definitely not as RPG as Fallout 1 or 2, but with a focus on storyline, unlike FoT.
The really tricky part will be making the Fallout original power armor for Tactics (unless it's already been done, didn't find it in the files section, something I'm unable to do (I can map though).
I've made a few scrap maps in the past, it's the whole coding thing I suck at.