Might be in the wrong forum here!
Threadfall is discussed on pages two and three of the Sungazer Chat topic in the SWE forum, but essentially we follow the EFH Threadfall dates since EFH and DCW share those and they're further apart than we've calculated the river is long. Threadfall dates are marked on the Sungazer schedule in the References topic.
We decided that the roof is lightly metal coated, and if you look at pictures of riverboats you can see that the roof covers nearly all of the deck area so little else other than watchfulness would be required.
I think the riverboats would tie up during Threadfall, though.
I'll cross-post this into the Chat topic so that it's in the right place if anybody needs to refer to it.
