I bet the first modded to offer a weight reduction mod will bank. If you change the power transformer from an EI type to toroidal most of the weight will be gone. The tricky part just adjusting the power supply, toroidals are more efficient and have less magnetic leakage. I bet someone could even sell a kit, maybe transformer and drop in power supply board? If someone could just tell me which transformer to use and where to get it I would try it myself, I've built simple amps before.