Best bet would probably be to check the TARDIS rebuilders site http://tardisboard.proboards43.com/
they have some amazing boxes on there as well as consoles and nearly everything else "Who" related.
For what it's worth, I've asked nicely various times over the course of many years, and haven't been able to secure an accurate set of Season 18 plans, myself. So if you have better luck, let us know!
Yeah, it's tough to show up out of no where to a group like that and just ask for plans.
That's why I asked here.
I get the impression that it's one of those items that has many variations so something close is probably good enough for me.
Although fairly detailed I was hoping for something a little more clear than the above drawing. I had that one already. But thanks anyway.
The guy I did the graphics for was restoring an original so I wish I could find him. He could probably give me prints. I'm just too scatter brained to remember. Heck the other day I laid up some fiberglass with no catalyst in the resin.
I have been wanting to build one of those myself. I have a set of plans for the origenal police box that are really good. If you do not have these I can try to pull them out of the frame and shoot a Hi-Res pic or try to scan it. The baker box is slightly different (I think the photo above is from the 1983 technical manual and is the Baker box) but it might get the basic sizes and the rest may be easy to figure out from there. From what I have been able to tell you just leave out the middle roof riser and and they are close to the same.
Which Baker box are we talking about? The first one that came to mind was the Logopolis Box from near the end of the Baker years (I think the 1980 box from that line up). I think there were at least three.
I have been commissioned to build one of these with outdoor survivability and portability as the top issues.
Therefore I am looking at doing a single wall pattern then molding that and making four fiberglass walls that bolt together on the corners. Capped by the roof.
With mold in hand I might make walls available.
I too like the 1980 version best. Reasonable size and better proportions.