Re: Thunderbird. Great build, Sensei Tim. I used the 1776 Effects PCB, and though it IS a little noisy if you turn the volume all the way up, it's no more noisy than your average tube amp.
Having built several "amp-like" effects now, I'm of the opinion that they make great mild to high gain overdrives but should be used as stand-alone pedals into a clean amp. For live use, you want to dial in a particular sound then set it and forget it. They also don't seem to like to have anything but a clean guitar signal at the input, but others may have a different experience.