RE: Dinghy cradle
I have no idea who designed, built, and installed it other than whoever it was was in your part of the world. The boat spent the first 25 years of its life in San Francisco Bay. When we bought it, it was berthed in Alameda with the name "Grand Destiny." The owner had just bought a GB46 and didn't want to own two boats so he told a broker to sell the GB36. The first thing the broker did before listing the boat was call the GB dealer in Bellingham/Seattle to see if they knew anyone who might be interested in buying an old GB36. About 15 minutes after that call and the arrival of the faxed specs, my wife and I walked in the door of the dealership to talk about GBs.
The boat has been documented from the start so somewhere we have a list of all the previous owners. The owner before the fellow we bought the boat from kept it in Sausalito and the boat was named "Christopher Robin," the lettering of which you can see when the light is just right on the slightly raised gelcoat on the transom where the letters used to be.
The dinghy is a Montgomery Model 7-11. From what I've been able to learn on the internet Montgomery is/was a very reputable manufacturer of small sailboats up to lengths in the mid-20s also based I think in the SFO bay area. It has to be launched and retrieved with the GB's mast an boom, a somewhat time-consuming process, but it's a wonderful little boat for one adult to sail. But its small size and "tippy" nature make it unsuitable for a utility shoreboat, hence the ugly but very stable Livingston we put on the swimstep.
As an aside, if money were no object, you should truck your boat to Puget Sound sometime for a year or two. In my opinion, you've got an ideal boat for a couple of people to explore this whole region from the San Juan Islands all the way up the Passage to SE Alaska, particularly with fuel prices going the direction they're going right now. I know you've covered some of that ground in cruise ships, but a boat like yours would be perfect for exploring all those bays and inlets and fjords and places the cruise ships can't get close to.