Yes they are very well built and strong too. I was at Performance Cat about this time last year getting some Inter spinnaker parts for my 5.8 and made some inquires on the 580. They were in the process of manufacturing and few for shipment to Europe and took me back to show me what was going into them. I think the bows may be a bit heavier because of some additional horizontal and vertical bulkheads. At the time I was quoted a price of $12K and don’t remember if that was with or w/out the spinnaker package.