My daughter Sylvia (age 13) is not interested in model building but quite the Whovian, so she and I are building a TARDIS from scratch. This won't be any contest winner, but we're having fun and this sort of project is excellent for modelers with children. It's educational as well, involving measurements, scale drawings, and even mathematics. (Fractions and decimals and percentages--oh my!)
Her first Doctor is the tenth (mine's the fourth), so of course she'd like her Tardis to match his. We used this drawing: http://billrudloff.c...TARDISfront.pdf I don't care a bit about differences between Tardises (if the chameleon circuit doesn't work, how can it change? BBC carpenters working on short schedules without proper plans, that's how!), but it seems that the best plans are those that most closely resemble a real Mk.2 police box.
We also had a good supply of popsicle sticks, which are fine for building a Tardis five inches high. The above drawing is 1:12 scale, making it ten inches high, so we scaled it to 1:24. We found the sticks hard to cut, however, so much of the build is balsa. Here's a pic showing most of the progress so far:
Here are links with more pictures
http://bellerophon-m...ratchbuild.html
http://bellerophon-m...chbuild_30.html
http://bellerophon-m...ratchbuild.html
This should be finished up in the next two weeks (school starts again, and my daughter will have homework. A project like this makes for excellent work-avoidance).