We're trying to budget and plan our future farm build out and we've run into yet another question we really want some wisdom on. We plan to have a maximum Dexter population of ten breeder cows, one bull and their offspring until they are ready to go to auction or the dinner table. We'd also like to be able to park a medium frame tractor in the barn. We plan to have a small hay loft. Any thoughts? Is this 40' x 40'? Or smaller? Another question, concrete floor or just dirt?