This may sound stupid, but here goes. If I wanted an exact copy of a tele, I'd buy the cheapest tele body I could find off of ebay, make templates from it, measure everything and sell it back on ebay.
Teles are easy to find and going this route would ensure that you get the best measurements possible.
As for making a plan and templates from pics, I did it for my last project. Its a Randy Rhoads polka dot V guitar. I got a picture of the original that was as straight as possible. Although the final result is really good, I'm sure its off in terms of general geometry. It was a good execrise though. Basically, I made a Randy "style" guitar. Not a copy, not a replica.