I agree the Tartan, a shed would not work here - first it would have to be air conditioned and heated. I think it would be hard to keep moisture from building up in any season. Are you sure you need a computer? Maybe a little lap top for the price of a shed and then the sewing machine will get the "prime spot". Also - don't forget to think about storing up, you know, use the walls not just the floor. Now don't think that moving you sewing machine out to a little table and chair outside on nice days isn't an option.