I'm not a gunsmith, but I have owned two Tavors; a gun which I love, with the exception of its accuracy. I think that in order to get the accuracy down around the 1 MOA mark, someone would have to work the trigger weight down to around 2.5-4 pounds and ensure that it is smooth, with a clean break.
Next a heavier profile match barrel. The regular Tavor barrel is a "pencil barrel", as one CGN'er worded it. Perhaps, why the shorter barrels for this gun have been deemed more accurate, is because there is less barrel whip, as it is shorter and therefore more rigid. I'm curious to see how Mr. Smitty's 300 Whisper project works out, in terms of accuracy.
After that, and this would be one of the hardest steps, would be to remove the rail mounts from the barrel, so that it was truly free floated. You'd have to find another way to mount a sighting system to the receiver.
I'm sure that Ian at Herron, could take a swing at a project like this if he was not so busy working on ACR's, but I imagine that there are enough Tavor owner's out there now, for someone to invest in a donor gun and make a project like this work. I'm sure there would be years of work for any gunsmith would could create an accurizing package for the Tavor that would get it around 1 MOA.
I know I'd buy another one. Gotta be some skilled gunsmith out there ready to accept the challenge, and claim the CGN glory and $$$$$!