First, love this mod. Probably the single most useful mod available for KSP, especially when used with real fuels. Second, some feature ideas: 1. Either snapping or a gui to edit the size of the tanks. A gui like precise node's seems like the optimal solution to me. 2. Inflatable tanks. 3. More tank geometries: spheres, toroids, prisms. I'd be willing to try adding these features if you're cool with that. Edit: I would also like to commend the readability of your code. Very clean, consistent style.
