Hi Ed,
I put this up on another forum. but don't know if you frequent that one. It may answer some of your questions:
Now that the Italeri PT 596 kit is getting into modelers' hands, a number of recurring questions are popping up on the various forums, most dealing with kit-bashing. For those of you building this kit, the following may be of use:
1. The basic superstructure configuration of the Italeri kit applies to boats in the 372-383, 486-563, and 565-624 groups. Boats in this series seeing action included:
RON 27 (PT 372-377) - South Pacific
RON 28 (PT 378-383, 546-551) - South Pacific
RON 29 (PT 552-563) - Mediterranean
RON 33 (PT 488-497) - SW Pacific
RON 34 (PT 498-509) - English Channel
RON 35 (PT 510-521) - English Channel
RON 36 (PT 522-532) - SW Pacific
RON 37 (PT 533-544) - SW Pacific
RON 38 (PT 565-576) - SW Pacific
Refer to: Bulkley, Robert. At Close Quarters. (Washington, DC: GPO. 1962) for more detailed information on these squadrons.
2. The armament configuration of the Italeri kit is only suitable for some Pacific ELCOs and possibly a few of this series assigned to RON 4, the training squadron at Melville, RI. Photos of RON 37 boats, for instance, show them with a 37mm forward, but it is not the conical mount fitted to 565 on; rather, it is the modified 20mm tripod mount. Some, if not all, of the RON 37 boats also had an additional 20mm MK14 offset to starboard forward.
The European ELCOs were usually more lightly armed and the 37mm was seldom fitted, although I have seen contemporary news footage showing it fitted to 509, 515, 517, and 519 in place of the normal 20mm on the bow to port.
3. While there were directives for painting the boats at various times, you really need to look at photos to determine what boats were in what Measure. For instance, RON 29 boats in the Med were initially painted in a modified Measure 16 (Thayer Blue). However, if you look at various photos of them in Chun's American PT Boats of WWII, you'll notice that the shade of the decks varies considerably. Whether the darker ones were more recently painted than the lighter ones or whether they were a different color, I don't know. They all have the light-colored (white??) panel across the bow. There are photos of the RON 34 boats (English Channel) in the normal Measure 13, but also in a very dark scheme with much lighter deck furniture (ready-service lockers, etc.) with no two boats quite the same. In his history of RON 37 (PT 533-544) Leo Brown, who was with the boats as they were coming off the line, describes them as being gray (most likely Measure 13) when built. However, he indicates they were then sent to another yard to be painted a green camouflage, which from the photos in the book was Measure 31/20L (same as on 596). This procedure is consistent with the specs books.
I uploaded a drawing of the SO radar to:
http://www.coastalforcesplans.com/id21.html
It's one I drew for John Lambert and my Allied Coastal Forces of World War II, vol. 2
Al Ross