Engineer and Enchanter villagers

An engineer villager would have the crafting table as its job site block. It would trade lots of redstone supplies and have a workshop building with a couple of small contraptions. An enchanter villager would work at an enchantment table and trade enchanted books and stuff. There would be a few new enchantments that could only come from trading with an enchanter. The enchanter would have a building with a few bookshelves.