I can confirm the issue that user Ghostshark27 posted above. Apparently, the bottom node on the Critter Crawler is "facing the wrong way", resulting in a problem when trying to attach something to said node: it uses the bottom node on the part being attached as well, instead of the top one, making it impossible to create a proper staging sequence using said node (and causing all sorts of nasty clipping if you're trying to attach something taller than a regular decoupler). Other than that, the CC works perfectly, and I must say it's one of my favourite things: cute, cool, and useful.
