Hi,
Thanks for the response.
My design doesn't require a large floor space, it only makes it convenient. You can sit in a low chair with the bucket in front of you and roll it back and forth in about a 3 foot area, it will probably give more of a back and forth 'washing machine' type action that way as well.
One of these could also be used while sitting..
https://www.lehmans.com/p-532-pressure-handwasher.aspx