I have practically everything in this mod laid out in my head, I just have to have someone (or myself) actually write the code.
Recipes
Steel Rebar: 1 Steel = 2 Steel Rebar. Looks like a thick, ridged iron stick.
Rebar Frame: 10 Rebar = 1 Rebar Frame
Concrete Wall: 40 Concrete, 1 Rebar Frame.
Technologies
Concrete Wall: Requires 50 R+G science. Needs Walls, Steel Processing, and Concrete.
Entity Info
1500 HP Per concrete wall
Is a 2x2 entity (allows you to put turrets right next to it without worrying about biters hitting the turrets)
Graphics
A completely smooth wall, with "pillars" at intersections/corners and the ends, like the Cobblestone Walls in Minecraft. Like this:
