cool!
with laser machines its alwasy wise to protect your eyes. There are glasses you can buy specifically made to block out wavelengths from certain lasers. Most machines come with a pair, but may pay to invest in a pair?
Cant wait to see the finished product.
Side note... be wary of what materials he wants to cut (i am not familiar with mylars chemical properties), some vinyls etc are bad news for lasers as they give off hydrocholoic acid :/