"Just a concept I drew up, based off of a buildable for a mod for the original freeware QuakeWorld Team Fortress from back in the day. You can see that here:
https://www.youtube.com/watch?v=HXdDjaZ6ezc

Anywho, it was a concept for a potential possible teleporter replacement, the specifics below from my Deviantart page:

"This is actually an idea I've had for a very long time, based off of a buildable in a mod for the original QuakeWorld Team Fortress mod known as Custom TF. But I never touched the idea because I wasn't sure if it was even possible to do this. That was, at least till the new medic update in Mann vs Machine that has the medic have a deploy able shield upgrade that has a very similar concept.

Obviously though, it cannot work the same way as the medic's shield ( and definitely not like how it operated in Custom TF ). That would be waaaaay to overpowered lol. First off, this is to be a Teleporter replacement that allows the engineer to build a "wall" that keeps enemy ( and friendly fire, to keep it from being OP ) from passing through said surface. Players, both friendly and hostile can pass through it, maybe the enemy will get hurt a little like the medic's version does in MvM to the robots who touch it. Disguised spies should not take any damage from the shield when they pass through though. I purposely left a small gap on the floor so that the enemy can still shoot peoples feet ( and use explosive to hit people that venture too close to the field. The ammo indicator represents how much abuse the shield can take before overloading ( on both the structors themselves as well as the engie's hud ) and shutting down, allowing any and all fire to pass through. Maybe the force field needs to be down before the buildings themselves can even be damaged as well perhaps? ( Well, besides sappers which can be applied directly even with the force field up, which will disable to unit )

Engie should probably beable to melee it to help bring it's power levels back up, but it can possibly recharge on it's own over time if not taking damage? Just tossing a few idea's out there. It'd best to be a PDA slot so the engineer can still use whatever sentry he'd prefer to use. There's also needs to be a limit to how far it can reach, maybe make it multiple engineers can connect multiple force fields together perhaps?

Not really much else to say, but I'd like to hear opinions on what people think. Thanks for the time BTW""