Using logic sense, it's really easy: don't build other stuff. If you see a guy getting an experimental out at minute 15 you can almost be certain the other team "fucked up" because he didn't have any other real defenses (besides his/her poor teammates).
Now, if you feel like being this guy (I certainly did), it's a simple thing to do. Just spam engineers out of your first factory during the whole game. Focus on upgrading your mass extractors one by one to T2 followed by putting mass storages around them, make sure they are protected by TMD. Then upgrade them to T3.
Upgrading your mass extractors to T2 can be done simultaneously in case there's enough reclaim available to
NOT stall mass.
Depending on how many mass extractors you've available to upgrade, and which are located safe enough to do so, you can get an experimental at two T3 mass extractors, although I prefer to upgrade four mass extractors to T3.
The most important thing to note is that this is one of those strategies that's not static. If you see your team getting absolutely raped it could be you have to stop upgrading your economy and get a couple of land factories up to support them with T2/T3 units. But if they are doing fine: don't build more than two factories in total. One for T1 engineers, and one for upgrading to T3 for the T3 engineer.
Especially early on your only real tribute to the team is your ACU, so make sure he is useful those first 5-10 minutes into the game. And make sure your whole team is not going for this strategy, that's a death sentence!