Hi Gap,
I assume there was a clash between ID's in your file and something in my set-up. Therefore I remapped IDs and all worked.
The 2nd CTD was my being dumb - hadn't noticed that Kendras had included a Locations.cfg in his mod. Think his called up something not available in my setup.
I found that by changing the Node-Reef1 Node Positioning Translation Y value I could lower and raise the reef in the water, actually submerging it altogether, or having it float in the air.
Here is the your modified .dat file:-
https://www.mediafire.com/?6h7401kv6ca55op
MLF
PS: - didn't see your last post re the ambient occlusion texture. Will give it a go, but maybe tomorrow.