Yup, exactly. I steal a lot of ideas from AD&D; it's probably due to all the Baldur's Gate I played during my formative years. Archetypes are basically just renamed kits.
Spheres were, for the benefit of those who aren't familiar with them, to AD&D priests what domains are to 3rd edition clerics. They were fairly broad categories (astral, charm, necromantic, elemental, war, creation, protection, et cetera) that dictated what spells your priest had access to. Major access gave you spells from that sphere up to 7th level, minor access only gave you spells up to 4th level (I think, maybe it was 3rd), and no access meant you got diddly-squat. It was a way to justify, using in-game terms, why a cleric of Pelor might not have access to the Animate Dead spell.