I was also looking at some pics of the studio model and I notice on the 'toe' it is actually a 'double claw' instead of the single claw that comes with this version. I have two of the old AT STs that were released back in the day and they are the 'double claw'. Also, the base of the claw seems to be more trianguler shape rather than the rectangular shape that this one has. From the studio pics i have (and I could be wrong) but they look like the more triangular shape from the old Kenner version. Have you thought about swapping them out? I am using the "From Star Wars to Indiana Jones: The best of the Lucasfilm Archives" book as my info for studio models to make these comparisons. Just wondering.
I love modding these toys because they are never correct and I, by no means, have the funds to spend several hundred or even thousands of dollars for actual studio scale versions of these (as my girlfriend used to put it) "sci fi doo-hickeys". I was raised modding stuff with duct tape and Elmers glue. LOL My first mod was back in 1977 when I took a 12' GI Joe and wrapped him in black electrical tape and the in white football tape to try to turn him into a Stormtrooper........God, I'm old.