The VIIB snorkel mask is in the /data/library/Sensors file, but I'm leery about messing with it as it fits the VIID so well. I hate to edit the the subs external models to fit the planks, but it might be easier than creating a new plank model and writing it into the equipment and upgrade upc's. I don't have a copy of SH3.
<edit> Ain't particularly thrilled with the original mapping, but plank resized for the VIIB at the nodes original location. I'll remap it tomorrow.
