From my personal experience, I found an adapter between 1.25m and 2.5m was a little out of place. I had both size fuel tanks, but still didn't have the adapter to attach them (I may be overlooking something here though). I also found the TAC life support slightly out of place. I get the small tanks just right, but the regular sizes I feel a too late, and then the larger sizes are straight after. Also the procedural fairings seem out of place. I had the base for them, but not the actual fairings to use. Again, I am no expert, this is just how I felt after one measly play of it. Still! I awesome tree, and after trying a few out, this is what I have enjoyed the most, so thank you!