That is simply a beautiful picture.
The parts washer looks great. At $20 and a little fun time, that is a bargain. That is one thing I would like to have, but limited space keeps me in a stainless steel and some cleaner - Simple Green, gasoline, etc. It works for me.
You have the knack at getting others to contribute building supplies toward your project. Awesome. And the ride with a good companion, food, brute strength and awkwardness, you are on your way to finishing the inside of your shop. I wouldn't push too hard at getting them cleaned, dried and installed. You may want to wait for the weather to warm up a bit. Putting the boards up in the cold temperature may lead to unwanted warps and irregularities as they thaw out in spring. Although you probably have that problem solved as well.
Keep up the great work!