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Dear Ms. Doss,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located two series that may contain general construction information about forts built in the 1850s. They are Fortifications Map File Plans of Military Forts, 1818 - 1941 and Maps and Plans of Former Military Reservations within the United States, ca. 1838 - ca. 1930. For access to these series, please contact the National Archives at College Park - Cartographic (RDSC) via email at email@example.com.
We hope this information is helpful. Best of luck with your research!