Nice sink and stand did you make it or find a good deal on Ebay? I still use a bucket, though I run a hose to fill and add water to my water jacketed sump pot and it has a pore spigot so I can draw warm water out and top up the tank with cold. This way my septic system is to water the grass outside the shop door.
I agree with Efmesch idea about protecting the plywood, but use a product that will stand up to the abuse like a commercial grade urethane, or even vinyl tile or vinyl plank. If you use a product with seams make sure that you put a sealer on the floor to stop the spilled honey and water used to wash it, from seeping under the tiles. A good quality deck and floor paint will seal it also and make clean up easier but it can be scratched easily if things get dragged and house hold quality vinyl flooring will tear fairly easily.
