Thanks for the advice.
I decided to take a step back. I still have some nice weather ahead of me before it turns cold and there are some things I have to take care of on the cars for winter.
Rather than spending the remainder of the fall working on the workshop, I'm going to concentrate on getting up walls, insulation, electrical and lighting. I have some waist-height shelving in my current workshop that I use as workspace - I'll just move that in for now. I can knock that out pretty quickly.
I am going to build a sturdy large table that I can knock down if necessary, and also work on getting the compressor quieter (see my other thread). Between that, and just organizing junk as I move it into my new space, I'll have plenty to do.
I figure I can build all sorts of cabinets, shelving, etc and such in the winter and that will be far easier if I already have the workshop up and useable, even if it isn't exactly what I need. It'll be a work in progress for awhile, but it will still be better than what I have now.