Part of what fascinates me about the TOS Enterprise is that it, unlike any other Star Trek spacecraft, continues to capture the imagination of so many fans. So many people want to know what it would be like to walk the decks of the "real" ship.
The original series was vague and inconsistent about many details of the Enterprise. It amazes me how many different and yet similarly valid interior layouts can be made of the ship.
I love Franz Joseph's Enterprise blueprints. In my mind they're not the indisputably definitive rendition of the Big "E." In my mind there can be no indisputably definitive rendition...and that's part of the fun!
Part of what I like about the FJprise is that it has no "credible infrastructure." Consider the basic configuration of the ship -- an enormous disc and huge twin engine pods attached to a lower hull by thin struts. The technology just to keep such a structure intact must be magical by our standards. The FJprise's interior is similarly magical.
The FJprise also has...bathrooms, and in more places than in the crew cabins. The visicoms, inspired by the holodeck-like description in The Making of Star Trek as well as by real-world submarines, are cool as well, as are the section isolation doors, expanded medical, science, security and engineering areas, the turbolft repair area, and the duplicated bridges and engine room areas in both hulls. The FJprise is indeed two ships in one.
The FJprise was my first glimpse at what a "real" starship might look like -- Trek or otherwise. The FJprise isn't as "faithful" to the trivial minutiae of the TV show as it could have been, but it fueled my imagination more than any other set of Trek blueprints ever has. To my mind only the Whitefire Enterprise-D blueprints and the Rupprecht/Rosenzweig Avenger plans come close.