Drilling in amazing clear cast

I will be using the amazing clear cast resin to make some objects that will be using magnets to keep them secured together.

My question is how well does this resin take a forstner bit.  I understand I can place the hole for the magnet as part of the mold, but there is potential for the size of the magnet to change later.

*side question: is there a recommended adhesive to attach metal to acrylic?

thanks for helping out a noob.