I have a couple of transformers kicking around for an 18W Marshall style amp I'd like to build. I'm eyeballing an 18W Lite, because the simpler the circuit, the less that can go wrong now or in the future. I'd prefer to source my own parts for a variety of reasons, and I was wondering how many of you go about sizing, buying and punching the chassis. I have greenlee punch sets around for round holes, but the power transformer hole would need a pretty particular shape. It seems like the people who have 18W Lite chassis w/ plates require I buy a whole kit, or I simply don't trust them. Should I be sourcing a pre-punched chassis, a blank chassis with advice on punching, or should I just break down and buy a kit for this one? The other option is to build a regular 18W marshall with both channels. Any recommendations would be appreciated. And thank you in advance.