Robin, weren't the Guide and the OTCA different boats. I thought the OTCA was built on the Yankee forms after the 50's. If it is a Guide I'd like to know how it compares to your Chestnuts to paddle.
The previous owner told me it was a Guide but when we pulled the stem bands off it's has 16 OTCA written in pencil on the canvas so I guess it's an OCTA. I'm not to knowledgable about Old Towns though, and I probably will sell this canoe so I'll never paddle it (fear of scratching the paint syndrome)
I had an 18' OT Guide that I took last fall deer hunting, it was a nice paddling canoe when solo with a load and solo with out a load after camp was set up, but other than that I can't say much about how they compare to Chestnuts. I liked the looks of that 18' I had, (sold it), nice curve on the stems, well built and looked like it could take a beatin'.
My 15' Chestnut Chum is like the OT 50 lb'er but I have never paddled a 50 lb'er so I can't compare, I have seen them and they look really nice, you know, sittin' on the lawn at Paul Smith's WCHA, not sure if I ever saw one used for tripping though. I bet they would be a pretty good solo canoe with some canvas packs up front. I think it's illegal to put a blue barrel in one, I read that somewhere.