It may have changed but last time I tried the wand turtle was broken and not transmuting things.
Thaumcraft is an amazing mod but the transmutations always seemed too tedious to be worth it unless you only needed one or two ingots and you really really didn't want to go digging. It also takes some much deeper research, dozens of silverwood saplings and/or very fancy bees and a good grasp on how aura works to have a big aura drain like that running all the time without making your base uninhabitable.
Thaumcraft is an amazing mod but the transmutations always seemed too tedious to be worth it unless you only needed one or two ingots and you really really didn't want to go digging. It also takes some much deeper research, dozens of silverwood saplings and/or very fancy bees and a good grasp on how aura works to have a big aura drain like that running all the time without making your base uninhabitable.