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Are there reliable plans for each of the two versions?
Yes, I know Crash 40-45 and have been there several times. They actually didn't find a G-1, but there was an engine found in the Ringvaart around Schiphol. We (not meMarcel, I recently read an article about a historical group in the Netherlands that may have found the crash site of a Bf109 and G.1 (Mercury version)...have you heard about this yet?
The group's name is "CRASH", they operate a museum and have been doing alot of work in the Randstad Region that includes investigating many of aircraft wreck sites.