Hi. Welcome to the forum (again)!
It looks like you have made a good start on the machine and it looks a great size for doing things like guitar bodies.
I would not worry about the 2 weeks for your drivers, you will probably have heaps of things to do yet on your machine so the 2 weeks will go pretty quick. Anyway even ordering from an Australian supplier will take a week, possibly more.
Everybody will have their own thoughts about the best drivers but one thing I will say is to check that the drivers are correct for the type of motors. It looks like you are thinking of bipolar motors and I'm pretty sure the hobby CNC driver is unipolar. That won't work.