if I understand you correctly you wanna print of just the "wires" and pads.
You have to "remove" all the layers you don´t need.
In the main menu click "display/hide layers" then you have to unmark "tplace" and "bplace".
Before printing you have to mirror the image.
BTW: If you´ve finished your project it´d be nice if you could send me the files cause I always wanted to get into class a by a small amplifier. And please report how it sounds.