Your best bet with regard to British WWI submarines is BR-3043:
http://rnsubs.co.uk/dits-bits/br-3043.htmlThere are also plans on the Royal Museum Greenwich site, although only relatively small previews are availble for free; the actual scans are unreasonably expensive even for personal use:
https://images.rmg.co.uk/In terms of American submarines, many plans can be found on NARA's website:
https://catalog.archives.gov/search-within/559623?availableOnline=trueThe only set of drawings I am aware of that is sufficient to create an accurate model are those of the T-class:
https://catalog.archives.gov/search-within/159728144https://catalog.archives.gov/search-within/53486362Jacob