It's been my experience that you will find the majority of Airsofters will sit around and announce phases such as 'man, it'd be cool if we had one of those' or discuss in great detail on how to get a certain device built or functioning... but that's as far as it goes. It's just really talk.
Showing up with a home-built thingamagig at a game will get alot of attention, but won't create a windstorm of people running home to make their own that you are worried about.
Very few people posess the tools, understanding, time and tallent to actually do it. In fact, you'll probly get sick of hearing people asking you to build them one.
When the going gets tough... the tough go cyclic.