I burned up free time before work by just playing with the cfg... I solved the issue that is just another one of those vague things... Inside the CFG, there are TWO PRIMARY axis that dictate what DEFAULT orientation a part must be facing in order to be attached. These axis are Y and Z. The order of Y and Z is important in the CFG. The last read axis determines what default orientation a part must be in to be attached. So if your last node_stack is a Z (front/back) orientation in the CFG, the first child part must be aligned as such. Otherwise.. if you want the regular Up/Down orientation for the first child part, your last node_stack commands must be the X axis. Side orientation last, Side orientation first in VAB node_stack_UP = 3.7549254,1.657563,-3.315132, 0, -1, 0, 0 node_stack_FRONT = 3.7549244,-1.657569,-3.315131, 0, 0, -1, 0 Top orientation last, Top orientation first in VAB node_stack_FRONT = 3.7549244,-1.657569,-3.315131, 0, 0, -1, 0 node_stack_UP = 3.7549254,1.657563,-3.315132, 0, -1, 0, 0 This fact has been undocumented, and is now clarified. I am working on custom connector parts (some)with 20+ attachment points and was having problems with disappearing nodes. You'd think you can write a CFG with X,Y,Z all day and not have to worry about the order, but you do...