I just uploaded http://www.nexusmods.com/skyrim/mods/69061 to the Nexus, this time for Argonians to clear and furnish a flooded ruin. Since I found myself having to re-learn half of what I did for http://www.nexusmods.com/skyrim/mods/64038, I wrote it all down as I went along, and made myself http://ghastley.org/Skyrim/ModNotes/HearthfiresMods.html that covers everything.
Some of this duplicates information found at the Creation Kit Wiki, which was a valuable source for individual items of knowledge, but didn't bring it all together. Other parts can't be found there, and I have no problem with it being put there if anyone has the time and inclination, especially if they can add anything in the process. I'll continue to maintain the composite document, as I think the world needs both.
This thread is for feedback, ideas for extensions to the Build-Your-Own process, etc. I'd also like to know if there is a good answer to the lumber mills dialog problem that I haven't thought of. I might have to request a change to the Unofficial Hearthfires Patch to support a Global for "homeowner needs lumber" that any such mod can set.