They moved the t-piece when they changed from ldd3 to ldd4. you can now find it in the section with the gears near the bottom of the list. I think it's available in the universe theme and definitely in the extended theme if you have it.

Please tell me what that T-shaped piece is called, I have not been able to find it anywhere in LDD. I do like this design, and might edit it, I plan to make my own AEGAKS mech soon.

Sorry, how does that work, exactly? Look at where the head is situated. The only place that the pilot cannot directly see is the 180 degree arc to the rear of the unit. If you notice, because of the positioning of the head, it CAN'T either! So there is NO point to having the head!

@Mithryl Dlarix The reason behind the head is so that the pilot has a greater range and perspective of the battlefield..or at least, that's to my understanding.

This is looking great. I have to wonder though, what is the point of the head? The pilot can see through the window and could have a holographic HUD on the window. Sensors could be placed anywhere on the body--so why does it need that out-of-place looking head module?