Thanks all.
CY the town will not allow any footings unless i was making it a permanent building then there is a whole host of things that had to be done ands lots more money to spend because of them!!
This way I call it a shed and i have no inspections or any other bull crap. All sand here and water does not sit on the ground, so mud not a bad thing here.
All I can do is build and see what happens over time?? Good practice for the next one, I have never built anything like this in my life!