Good list thus far.
With "Average Age of Maturity" - I'd like to know life expectancy. We hear crazy numbers about how boas can live to be ~40, but what is the actual expectancy on average? Also, when do they become considered "seniors" and does their care need to change in any meaningful way? Is there a difference in these things by locality?
I like how you plan to call out Boa Sigma separately or indicate where it fits in the BCC or BCI grouping. Selfishly, I'd also like to know where Boa Amarali fits or gets broken out separately as well (I just got one).
Other ideas:
How to find and/or evaluate a good vet.
Probably group with "Handling", but I'm curious what others do with their boas. Is it simply handling or do they have perches, climbing apparatus, or other enrichment items/exercises for when they're out of the enclosure?