Namely the sifter, Crusher, Lathe, Shredder, and Oven. Although it seems the shredder, and Sifter are the things i'm interested in. The worldgen is far improved in GT6 with new materials, placeholders for things without uses, sand ores, Ores for underground biomes, and compatibility with that mod, there aren't many machines but, the ones that exist now seem to of great necessity for your addon
Since it will be Alpha the only ones i care about for now are the Sifters, considering that everything else i'm looking for is already in and i plan on having the unused metaitem dusts in GT give ore rather than the straight dust, considering potential byproducts