@Reconstructed Rebel and all, thank you for the correction- it's been fixed!:
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When it came to town building placements, many were based soley on the 1858 town map (unless I found a reference to a building's modern address/coordinates).
1858 town map has the Rupp house just south of Welty across Baltimore. But this might be a cases where the older maps are inexact or derived from each other.
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For anyone who wants a copy, the only "free" high quality version of 1850 Sidney town map I could find was on the wall at the Heritage museum:
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The heritage museum also had this incredible modern map of 1863 Gettysburg with full buildings outlined and outbuildings/barnes delineated. No sources on it, but I've assumed it to be accurate where I can find corrboration from the 1858/1850 maps:
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In general, I've found surprisingly few town maps with citations/names of owners exist out there--apart from the above. If anyone knows of any other sources, please share! Feels like I'm missing something obvious...