Garden/potting shed

I'm drawing plans to build a garden shed with a potting shed attached. I want the messy potting out of the shed used for storage. I'm thinking of putting a wood floor in the storage area and gravel or rock for the floor of the potting shed because I could use the hose to clean after potting. Have any of you ever done that, will it work? I'd like to hear the pros and cons. I'm also planning to put walls only about half way up and screening the top portion so I can see outside while I'm working and screen will keep the mosquitoes out. If you know where some plans are for this sort of constrution, I'd love to know abou them.