Hi Im interested in your product, the details I need Quantity: 1 Initially we'd like to order one for testing - then approximately 20-30 per project/month but can order up to 100 at one time for more economic shipping.Can you please confirm internal usable dimensions:Depth: at least 400mm (at least 50mm of space in front of the rails and 350mm of space behind the rails)In addition we are interested to know if you are able to offer other sizes, if this was the case we would be interested in pricing for a 6RU size.I look forward to your reply. Kind Regards,Andrew Cox Show More