Looking good greasegizzard
I made a juice rack back when I started mixing my own using scrap wood I had laying around from other projects.
I finished it with a few coats of satin urethane. juice has not affected it in three years. I didn't put anything on the bottom, but it just sits on a wood shelf and doesn't move around much. If I was worried about it I would probably glue a piece of canvas on the bottom.
The draw back to gluing something to your project is leaking tanks. The juice will eventually saturate the material and if it is on one of Momma-Bears tables there will be hell to pay. Been there dun that.