List of resources for anyone wanting to specify ship designs & sizes for the Star Trek background.
Sites that specialize in Star Trek technical data and ship specification:
www.trekcore.com screen captures and other useful reference information from the series and films
www.ex-astris-scientia.org starship and fleetyard information best for technical data
memory-alpha.fandom.com large Star Trek encyclopaedia with ship information
www.st-minutiae.com has comprehensive size comparison charts
ststcsolda.space large archive of FASA compatible ship designs
fasaststcs.com large archive of FASA compatible ship designs and recognition manuals
www.cygnus-x1.net huge archive of Star Trek blueprints and manuals
Federation Commander portal for the ADB game set in the extended TOS era
Star Fleet Battles portal for the ADB game set in the extended TOS era
A Call to Arms Star Fleet Mongoose/ADB game set in the extended TOS era
Babylon 5 Wars Star Trek ship conversions
Books for technical specifications and ship design. Some of these are still in print but those out of print have digital copies:
FASA 2204 Ship Construction Manual
FASA 2301 Klingon Ship Recognition Manual
FASA 2302 Federation Ship Recognition Manual
FASA 2303 Romulan Ship Recognition Manual
FAN 2305 Gorn Ship Recognition Manual
FAN 2305 Orion Ship Recognition Manual
FASA 2012 Star Trek the Next Generation Officers Manual
FASA 2227 Star Trek the Next Generation First Year Sourcebook
Star Trek: Ships of the Line
Star Trek Shipyards: Starfleet Ships 2151-2293
Star Trek Shipyards: The Klingon Fleet
Star Trek Shipyards: Federation Members
Star Trek Shipyards: The Borg and the Delta Quadrant Vol. 1
Star Trek Shipyards: The Delta Quadrant Vol. 2
Star Trek Shipyards: Starfleet Ships 2294 to the Future
Star Trek Shipyards: Alpha Quadrant and Major Species Volume 1
Star Trek Shipyards: Alpha Quadrant and Major Species Volume 2
Eaglemoss / Master replicas ship design booklets most of the data is collated in the Star Trek Shipyards book range
Star Trek Adventures Utopia Planitia Sourcebook (digital)
Instant Star Trek Technical Archive (contains most of the background books in one package)
Some Star Trek games have some very nicely modelled ship mods that allow the exploration of the ships in a live environment:
Star Trek Bridge Commander with the Legacy Mod has a full range of TNG DS9 ships
Klingon Academy has range of interesting Klingon designs
Dominion Wars set in the DS9 era ships
Starfleet Command I set in the TOS era
Starfleet Command III set in the TNG era
Sins of a Solar Empire Rebellion with the Four Years War mod