For amps, Fender generally used combos with open backs. Marshall used closed back speaker cabs. Fender/Gibson guitars guitars sound great through either set-up.
Open back cabs are not design critical. You can make the cab any size & shape -- as to height, width and depth -- that fits your convenience (and is stable and won't fall over!). Closed back cabs are sensitive to size and shape, including internal volume. This called Thiele parameters. Ideally this should be matched to the published specs of the speakers to be used. Info is available online; Eminence speakers I think has info on its web site. Or plagiarize from an enclosed 2 x 10 design that you like.