Hey Sawman if you check out bullpupforum they have a lot of good information there. Gear Head Works makes what they call a razorback. Brings the rail up to AR level. this would simplify optic-mount choices, but would increase hold over distance. I use a pepper mount with a 1-4 vortex pst. Very happy with this configuration. If it were a little higher it would be more comfortable but mine was quite a bit cheaper and works fine. If you get the primary arms extra high AR mount it works perfectly I have been told. As far as triggers go, there is a guy on bullpupforum that has developed a new trigger for the tavor, sold under the name shootingsight. There have been good reviews of his. I personally am waiting for the Geissele trigger that should be out by the end of the year. Also there are a couple of companies that are making different hand guards for it that hold lights ext. I am no expert but read a lot....LOL. You are also welcome to try my setup as well. Just PM me if you are interested.
Dave
Dave