Well, if it was built in 2006 with a 10mm bottom, there may well be cause for concern! I think it'll be dawning on you by now that year of build and original thickness are quite key parameters when asking this question. However, 2007 is a while ago for a survey to be taken as an indication of current condition. Any assumptions made on that information are little more than assumptions. We all know what assumptions are the mother of, don't we? You're right to wonder about this and I commend you for asking because, when we buy a boat, it's best not to be at home to Mr F. Up.