Well, who says they started from nothing science/technolgy wise years ago? We know from WC4 that the Border Worlders fighters fielded weapons technology that Confed fighters didn't, including leech cannons, scatter guns and stormfires. We also know that they were able to field fighters like the Vindicator, Banshee and Avenger, albeit in small numbers, which had a similar or superior performance to their Confed couterparts. Space fighters, or at least space fighters that are going to be anything more than manned missiles decoys, aren't just something that you improvise. Whether you're designing one from scratch (Vindicator) or modyfying a design from a non combat role like a trainer (Banshee) or cargo shuttle (Avenger), you need very effective research and design facilities, as well as the industrial capability to do the work itself. On the scientific front, we know that one of their scientists, Dr Brody, was such an expert in bio-technology/nano-convergence that the Black Lance had to take the risk of kidnapping her to finish their gen-select weapon rather than use their own people. We know that they were able to adapt and use cloaking capability in combat (something that Confed had mastered only three years ago) under very difficult circumstances. All of that suggests a fair technological and scientific base capabilty at the time of WC4. Given that they had that capability ten years ago, when they were just struggling to establish themselves a nation, it's rather silly to claim definitely that Border Worlds couldn't possibly have developed the Viper cannon. I'm not saying they *could* have, mind you, but I would like to see the basis for claiming that that they couldn't possibly have.
Best, Raptor