Hi Mark,
If you are after details have you looked in the following publications.
1- Dog boats at war, by Leonard C. Reynolds.
2- Allied Coastal Forces of World War 11 Vol 1, by John Lambert & Al Ross.
You will find all and possibly more than you bargain for in those two publications. I have Vol 2 of the Allied Coastal Forces and I have plans in it to scratch build virtually all the Vosper, British Power Boats plus the US PT boats. There is a good photo in the Royal Navy in Focus series on Coastal Craft showing MGB 604 which was sunk in 1942, I am considering converting my Dog to this one this winter.
David