I have the onslaught, and one of the helicoptors from the energon bruticus set. I also have the one plane that was a leg for the energon superion....picked the 3 up as idividual figs when energon was out. If I were to order the munitioner and crossfire set from fansproject, can I substitue the leg appendage from superion for the tank/leg appendage from bruticus and use the fansproject set? I plan to get the tank as soon as i find one to use, but in the mean time I dont want to order the add on sets and not be able to use them. If anyone has the bruticus set and the plane/leg from superion and if it does work, any pics of what it would look like would be great.