Oooh, that's an old one. 21 years old, in fact.
I've built (and rebuilt) a few lasers and don't know what he means by a "laser eye". If he means the laser source that's expensive. If he means the lens it's fairly cheap (still $100 or so.)
My concern would be that control boards and drivers and such have come a long way since then. Depending on what software you are designing in it might be hard to run your design software and laser cutter software on the same machine. Epilog makes nice machines, though.
Here's a manual: https://www.epiloglaser.com/download...ius_manual.pdf