Back in 1993, Michael Alexander created (at least) four technical manuals that were sold at conventions and (apparently) some comic book stores.
They're now all available online for your viewing pleasure:
Khitomer Class Experimental Starship
https://www.cygnus-x1.net/links/lcars/ma-khitomer-class-kfx-1.php
Garrett Class Experimental Starship
https://www.cygnus-x1.net/links/lcars/ma-garrett-class-kfx-2.php
Quasar Class Experimental Starship Program NX-1701-E
https://www.cygnus-x1.net/links/lcars/ma-nx-1701-e-quasar-class.php
NX-1701-A
The Enterprise That Never Was
https://www.cygnus-x1.net/links/lcars/ma-nx-1701-a-enterprise.php
Enjoy-
They're now all available online for your viewing pleasure:
Khitomer Class Experimental Starship
https://www.cygnus-x1.net/links/lcars/ma-khitomer-class-kfx-1.php
Garrett Class Experimental Starship
https://www.cygnus-x1.net/links/lcars/ma-garrett-class-kfx-2.php
Quasar Class Experimental Starship Program NX-1701-E
https://www.cygnus-x1.net/links/lcars/ma-nx-1701-e-quasar-class.php
NX-1701-A
The Enterprise That Never Was
https://www.cygnus-x1.net/links/lcars/ma-nx-1701-a-enterprise.php
Enjoy-