General R&D: Singular KDY-150 Planetery Ion Cannon
Instead of just protecting the entire planet, a single cannon can only cover 1/4 of the planet. Which, if the person or faction only wants to protect that 1/4 from planetery bombardement, that's ok. 1500 meters, the current build time for a planetery network, should be divided by 4, since only one cannon is being built. That equates to 375 meters. But, since a planetery defense is still a planetery defense, I propose a simple build time of 5 days, with the 375 meters being only the drain on the mantinence of meterage.