Sure, but how many engineers are you going to get in a raid? You could make it that there's a cool down of 2 minutes for hopper placement. That would prevent an engineer from single-handedly taking a peek at all the deathchests when the smoke clears.
Engineers are few and far between on the server, and they lack staying-power. Much like Masons, once you set up your town with gadgets and gizmos, what's the point of staying as a 'builder class' unless you'll have some use for it mostly every day? That's my 2 cents.
While on the topic, I couldn't help but think about HeroCraft during my short encounter with World Of Warcraft. You can have 2 professions in WOW and I thought how beneficial it would be to have 2 professions on HeroCraft. Of course, the price for changing a profession should skyrocket, or worse yet your profession would get reset if you choose to switch it.
Thoughts?