Some thoughts on an "accurate" build of the Revell Kearsarge:
I'm probably older than most of you (56) and I first built the Revell Kearsarge as an 11 year old in 1961 when it was originally released. Naturally, I made a total hash of it, and always wanted another one until about 6 or 7 years ago when I bought one on ebay for fairly big bucks (but nowhere near the $300-400 they ended up going for at the end). I also have one of the new releases. So I have a great fondness for the ship, and like some of you, I have thought about back-dating the kit to the 1864 version.
As has been stated in this and other threads about Kearsarge on this forum, the Revell kit is depicts a later version of the ship, based on plans in the National Archives and the navy's model at the Washington Navy Yard museum. These plans are (at least partially) reproduced in Donald Canney's book The Old Steam Navy, Volume One. My office has a scanner and printer large enough to handle architectural drawings and I was able to enlarge the plans to the size of the kit. What I found is that they are almost a perfect match. The hull outline and deck layout of the kit are remarkably close to these plans. The main differences are the absence of the poop deck, bridge structure and pivot gun on the forecastle deck in the kit. These could be easily added to the kit and you would have, I believe, a fairly accurate model of the ship as she was at the later part of her life in 1888.
I also enlarged Arthur Roberts' plans of the ship as she was in 1864 and laid the Roberts plans over the plans from the Canney book on a light table. The keel of the 1864 Kearsarge is shallower than the 1888 version, the sheer line is much lower, the bow profile does not match, and there are multiple differences in the sizes and locations of hatches and the layout of the centerline mounted armament. The masts and funnel structure on the Robert's 1864 plans are all drawn noticeably aft of where they are shown on the 1888 plans and where they are located on the Revell kit. This is something Roberts discusses in his NRJ articles, where he says the locations of these structures were among the most problematic aspects of his research.
I guess what this all brings home for me, assuming that Robert's plans are accurate or very close to it, is apparently how little of the Revell kit is "right" for the 1864 version of the ship. The kit's hull, deck layout, boats, fittings, armament and rig are all incorrect, to varying degrees, for the ship as she was when she fought the Alabama. When you analyze it, for 1864 there just does not seem to be much useable in the kit left.
Certainly not trying to discourage anyone from making the 1864 conversion, saying it couldn't be done, or that I might not attempt it myself, but the 1888 version is looking very good to me.