dbrunger,

Have you heard of AP-Lazer? We are located in Lansing, MI and manufacture class 4 laser machines. We are a child company of a wholesale granite distributor - we offer in-house laser etchings on the monuments we sell our customers. A few years ago, we began manufacturing laser machines with not only open ends, but also a removable top. Unlike the traditional 'boxed-up' laser machines, the removable top allows for engraving just about anything, because you can slide objects directly below. Front and back ends are open. You can even remove the laser top and laser etch directly on top of objects such as floors. In the past, we etched a 5 ft x 3 ft granite monument using that technique. You can visit our website, www.aplazer.com and see if that's something you are looking for.