goscrewyourselves
I'm the one
That one point alone is probably the biggest "disaster saving tip" possible.My biggest "disaster" was failure to get advice from knowledgeable people before starting construction.
Sounds like you went through a lot for your layout, and raises a point that may not be considered - what you intend to do with your layout, have it as a private concern or, as you have done, run operating sessions. Possibly for many, the thought of running operating sessions isn't even in the equation when they start BUT, if there is a likely hood of that happening it should be considered from the outset.