Rotterdam ships in 1652 and 1653

I have a good deal of information about ships hired by the Admiralty of Rotterdam and the Rotterdam Directors, but I only have partial information. I understand that complete information exists, but I don't know where it is, as it is "top secret, compartmented information", given that one or more publications are planned with that, and the author does not want to be "scooped" on the Internet. I am particularly interested in the Directors' ships and the Erasmus in particular. The Erasmus was commanded by Sijmon Cornelisz van der Meer and was sunk in the opening weeks of the war. I am not privy to any more information than that. I do have gun lists for most other ships, but lack dimensions for any of the hired ships.