if you're making them for yourself i say go crazy with set tardises, but if ur making them for others to enjoy, i'd say make sure there always a non-set version as from what i've seen the majority of people (including myself) dislike the set being the only option, thank you for including the option on these so far though

1975, 1976 and 1977 linked with the corridors

the tardis from the pertwee episode "the time monster", it was very unique looking with it's bowl-dels, plus it could have a switch to switch the tardis from doctor to master since his tardis in the time monster looks almost identical with only a few prop differences like the time rotor

The Meddling Monk's TARDIS.

I know this isn't one of the offical Tardises, but, would you make the Tardis from the Peter Cushing Doctor Who movies at some point?

mabye the inferno console ent

1982 TARDIS
http://www.themindrobber.co.uk/tardis-console-peter-davison-details.html

The Second Doctor's TARDIS from The Two Doctors.