I don't know why you say that, turrets blow up in one shot from a gren or a seismic. Takes the same time to place a wall as it does a turret too. Sorry teef, I just don't like tags, unless that's my entire name.
I did it last minute, I didn't want to have to navigate through steam's shitft+tab interface to our group page. Also, don't worry about it so much, half the players we had that were supposed to show up simply did not. One showed up late, one not at all, and one showed up early then took a nap right before the scrim started.