I wanted to post these earlier but they needed to be cleaned up and made a bit more presentable. All of the dimensions on the attached drawings were taken from actual cabinets. I would urge any interested 4345 owners to bounce the data off their actual cabinets.
I have a few other detail drawings I will add later but the info here is sufficient for use should someone decide to start building.
Note that I have labeled the port diameter as 4" I.D. The cabinets I took these numbers from were actually 4 1/8" I.D. Earlier in this thread Bo posted some pics with a tape measure layed across one of the ports. From that pic the diameter looks closer to 4 and definately not 4 1/8. I would hope there are both out there. Tubes with 4" I.D. are readily available. 4 1/8" will be hard to find.