Jackson,Mississippi is 140 miles North of the Gulf Coast.
I could pour a small concrete pad/floor (I own a small concrete mixer,it
has an electric motor to drive the mixing barrell around and around.I
bought it for $100.00 at a U-Haul store years ago when they had some
things for sale) on top of the ground in my back yard and make the rest
of the shelter out of heavy concrete blocks.Probally about four by four
by four feet.A piece of steel plate hinged on top with angle iron I can
weld around the edges would be ok and it would keep the rain out.
cuhulin