The Chickering I saw had a full parameter plate that was on all 4 sides mortised into the rim. Judging from the plate screws that poked out from under the mortise, I'd say that the plate was under the rim about 1 inch. Breaking apart the inner rim would be no real problem. Just an afternoon with a chisel and a router. Making it look like I had never done this was a different problem. I'm sure it could be done. Find the right veneer, glue the inner rim up in strips, clamp it all together, veneer and finish to match. Figure about 2 days of problems you don't anticipate and I'd be surprised if you had less than 50 hrs in the job. This is on top of a major rebuild. The pin block is also mortised in. Taking apart the inner rim would make this job easier, but still about 4 times as long as just making a normal block. At this point the job is getting quite expensive. The real question is, what do you have when you are done? An 1850 Chickering. Better to buy some lesser known larger piano from 1900-20 and rebuild it. Less time, less money, greater satisfaction. If you really want the case, find one built in the 80's and 90's. Plenty of rosewood from that era.
This PTG archive page provided courtesy of Moy Piano Service, LLC