Great stuff Tom! I can smell them already, just reading that lovely list!
The great thing I found in travelling around Spain (and Italy for that matter) is that you really do get to eat the landscape and taste the subtle changes as you move along.
Different local trends in texture, spice preference, dryness, accompaniment all signalling almost impercetable variation as it happens but ending up as a completely different product when you look back from where you are to where you started!
I think your biggest challenge will be trying to nail down specific recipes when almost endless variation, even on sausages known by teh same name is standard. Its like trying to nail jelly to a wall.
Good luck with this and I cant wait to get involved as the thread and the recipes develop.
Que aproveche!