Hey there! I'm a big fan of this mod, it adds a wonderful layer of realism to KSP. A quick bit of feedback, the helicopter tail rotor (EM-16S) is for some reason positioned in the advanced landing node, much later in the tree than the main helicopter engine and blades.
I dug through the files to figure out where the problem was, and it turns out, in the .cfg Breaking Ground, the Rotorengine_02 and Rotorengine_03 are well placed in their rightful nodes (the helicopter and airplane main engines) but Rotorengine_01 was nowhere to be found and I suppose it just showed up in advanced landing. Just thought you should know for a later patch or version... Thanks again for this great mod!!
Peace,
H