I like this, and I would prefer a set damage for running through the armed lasers instead of a ceiling turret.
But to keep the value of hotwires/technicians, give them a tool to repair/reset the laser defense, exclusive to those 2 classes, so only they can reset it, just like it is now with mines?
That way we keep their value, the advanced engineers are one of the most important units mostly because only they have access to mines.
Not sure how the HoN on flying maps would work with all of it's windows, a fuse box for each window?
The Airtower could have one at the front door, and one inside the tower, by the elevator hole.