I read through most of the first 10 pages of the thread, then from 26 to the end. Didn't see the "dV Question" heh. Figured it had already been asked but oh well. Figured it is not easily done, but thought I would ask. Your solution of importing the variables from other plugins would work perfectly from an end user perspective. An interesting quirk that would be nice to have some variables to avoid is that the wet mass of a craft considers the masses of all resources, not only propellants. This includes ablative shielding for heatshields. Needless to say, 1000kg of ablative material isn't the same as 1000kg of liquid fuel/oxidizer and throws your calculations off a wee bit. So, perhaps a variable that sums the total mass of all propellants on a craft? A bit messy in that you would have to identify which resources are propellants and which are not, but it would be helpful. There are dozens of other cool and nifty variables I could ask for, but I am sure you have other things you would like to finish