[aylad]

Hmmm..... in order....

no
see below
no
Kai's right, but see below
no
maybe later...

"Below"
I agree that the system will most likely be fine but I hope that the plants can be grown or perhaps found in drops, so the mages aren't totally dependent on stores.

Crafting should take a while, but perhaps you pick the number you want, and it plays the appropriate gani that many times in a loop? And you can sit back and watch without having to work the menu that many times. Same amount of time, but easier.