I'am wanting too build a shelter above ground , i don't want undergroung for a number of reasons #1 is i have a older brother that lives with me & he would have a difficult time getting down them steps, then there is my 100 pound doberman that i would have to throw down the hole & that would probally kill him, also don't like the idea of being below ground with broken water pipes & rain, would rather face a F5 head on then drown in a storm shelter(that might be over doing it but???) I'am thinking 6X8 feet, 6 inch concrete with alot of rebar & mesh, half inch steel door that opens in & faces NE, in oklahoma 99% of the storms come from SW I live 10 miles north of Moore born & bread OKIE that has never been in a storm shelter(never had one) but after the last 10 years in oklahoma tornados I think this above ground shelter is what Iam going to do.