Right, so the current on average only goes half way across the roof, and the voltage therefore drop tapers off quadratically. (Also I assumed copper, not aluminum.)
12AWG may not be overkill though, depends how far to the run start.
The ICs listed are also not reliable:
"WS2811" is the part...
As evidence see: https://scottledusa.com/product/seed-pixel-roll/
Where it says: "Copper Core: 0.16mm copper per strand (approx. 20AWG)"? .16mm(mm^2?) -> 25AWG, seems about right, certainly a lot closer to accurate.
You're only talking about ~1000 pixels here, where each draws 10mA, 10A total.
12AWG is plenty.
The "20AWG" rating is absolute lie. Most of the time that's 24ish if they say 20 on the seed pixels.
(But it's OK. You still get 100, maybe even 200, from PI points without any issues.)
If you go "buy" this sequence for zero dollars it maps to the presents easily and well. https://rgb-sequences.com/products/the-weeknd-ariana-grande-save-your-tears-remix
All Presents Bows -> Mini Tree Stars
All Presents Glow -> Floodlights
All Presents Ribbons -> Spiral Trees
That's a very open-ended question ... you can find a sequence on xlights.info, a lot of them will map to this prop but hard to be sure without trying them out. Or did you just mean as an example for copying effects for your own sequencing attempt?
I use OPS (other people's sequences). My chromaglow presents usually are mapped the following way:
Base (inside glow)->flood lights
Ribbons->verticals, such as pixel poles or house verticals or window verticals
Bows->Stars (on pixel poles, or all stars)
Taken together, this gives the presents...
Those are designed by Boscoyo. (Typically anything ChromaThis or ChromaThat would be Boscoyo... Also DayCor.)
If you are adding to xLights, the download would likely be Boscoyo Studio LLC->Christmas->Singing Elements->ChromaCharacters Christmas Tree 4 Mouth.
Be aware that...
To that I would add xLights sequences with singing face tracks... xlights.info is a good place to search, there are some free ones with the singing tracks. (There are presentations on how to do your own, but best to start with one that is already done.)
I recommend looking for videos that are more recent than 13 years. (Google: audacity xlights video).
You will find:
View: https://www.youtube.com/watch?v=2Vh-jgVowyY
View: https://www.youtube.com/watch?v=PBkva5tFmcY
Probably others, if you refine your search.
It's obviously scraping off other sites and doesn't bother to remember where and be kind enough to tell you that. It would also appear to be a "vibe coded" site... done by AI to "optimize for plausibility" but end up largely to be BS. See that this is obviously a John Storms sequence... but...
For intro/outro/jokes type stuff I've used Showtime Bumpers. There are other popular services, Demented Elf Productions comes to mind but I have not tried them.
See also: https://auschristmaslighting.com/threads/custom-intro-outro-service.16954
Read this post before reading chatroom - the suggestion in chat was to use DDP instead of E1.31, then this whole issue goes away. That's a great answer.