Unfortunately we are only the distributor of the product and not the actual manufacturer. We do not have a manufacturer that does custom made structures. As for the covering, you would want to make sure that the application of the tarp would be suitable for your weather environment. The structure would not be able to take a snow load of any kind, and it would need to be on somewhat of a slant or peak for water run off. Again it would only be recommended for a temporary structure not a permanent. The grommets of the tarp covering are spaced every 24 inches which would also need to be taken into consideration for the type of weather environment in your area.