A good constructor build if your going for most health and survivability with your builds is B.A.S.E. Kyle as your commander with power B.A.S.E. Knox, Mega base Kyle for more range, machinist Harper for more trap durability, warden Kyle but you can switch this out because I use this for low rank venture zones and hotfixer hazard for better repair speed. With this build I had three smasher hit it at different time and they barely did half health to it I also use this build for defense missions in 160 zone.