yeah, simple tin roof pole barn would be ok long as its got a bit of height,...no need even for concrete just bore out the holes nice and deep.…..bit of stone base and bobs yer beano ….need a few frees around it to stop windy tho...short term yes it is, we use to do it with hay and straw, tried sheeting it to, we have a shed now, yes it cost a bit but when you consider it should see me out I suspect it adds up quite well considering the number of bales it has and potentially will keep dry not to mention the other things it keeps dry when its not full of bales
. my next building project possibly.