I put a large hatch in my DS II but instead of having to crawl through the cuddy to access it, I mounted it on deck. I used it for an anchor well. Just remember that any floataion you remove should be replaced elsewhere.
Here is the link to my 11x15 lockable waterproof hatch.
http://groups.msn.com/RogerConrad/shoeb ... hotoID=198
It was purchased from a Boating Store dealer, (Discount Marine Catalog) and the product was made by TH marine (product number 232-HATL11152) for $66. These are readily available at any marine store.
It did not weaken the structure in any way. I also checked with the class measurer to ensure that it was within the class rules. (no problem)
E-mail me (
roger02@mts.net) if you want more pictures, but I get the sense from your post that you already have this hatch in mind.