I find it odd that there are turrets that fire only explosives, pellets, and saws but against a tanky bug like the fat bug or queen bug? These don't even work. There are no turrets that can damage fat bugs and it can be really hard to take on three of these at once. So why not make some more?
The boxing glove turret
A turret shape like the mortar turret (missile) that hit anything within a 5x2 block range with a large fast moving boxing glove, dealing damage whilst also sending anything flying. It will take 5 seconds for the turret to fire again and can damage the fat bug
The spike turret
What I mean by spikes is not the spikes that would instantly kill someone, I mean something like a spear strike, 4 of them, its only the melee strike, not the turret firing the spears.
The Flamethrower turret
Speaking of fire this turret could be an auto targeting version of the Flamethrower trap that works like the trap