Now that is cool for the garage. I have to admit, at first I thought you converted it to a fridge and had the appropriate garage necessities inside, but then I looked closely at the picture and realized those were cans of.....oil.
I have that exact tune up cabinet with the roller for tuneup info. Mine is missing the internal drawers. Since then I've acquired several additional United Delco cabinets - two wall units (each of which is essentially the base on that tuneup cabinet), a rolling shock absorber service cabinet, and a rolling A/C service cabinet.
I've been trying to find out more about the different styles available, like a period catalog or something. So far, all I've found is this ad from the mid-60s.