Project complete less picture's. the Spyder III 2x12 cab convert was very simple and sounds excellent driven by the 1 watt amp. the only stumble was mounting the 1/4 TRS input through the side of the Spider III. The combo amp has a surprisingly thick cab, to thick for a standard guitar input jack. to overcome, I connected one 1/4 to 3.5 mm adapter to another 3.5mm to 1/4 adapter (to give me connections I needed but also the length to pass through the cab) which fits internally into the "guitar" input jack (confused?). Drilled a hole and pushed the whole thing through. the only externally visible part of this whole project is a gold guitar input on the side of the cab.
My soldering skills are horrible, so that is delaying the pics, sorry, don't want to show my poor work. To do again, the speakers have connections for crimp on connectors, I would do that instead of soldering, but you work with what you have.
So for the first time in my guitar life I have non-processed sound. Not to sound dramatic but the sound heard is the sound put in. It's really naked and a bit unsettling at first. the notes stop when you lift your finger and suddenly your not as fast as you were thinking you were, or the notes buzz if you don't do it right and it's not hidden by a distortion effect. naked, unsettling, but I can already tell I am becoming a better guitar technician, maybe not a better artist yet, but technically better.
BTW, whoever gave me the Neutral point thanks! Don't know what it means, but seems better than the warning points above it.