Good looking li'l Tiger! I built that kit about 8 years ago, and recall that it was a nice build.
Are you going to leave it gray? While gray is by far my favorite color for German tanks, I don't think there were any late Tiger Is (with the steel wheels) painted gray.
But if you want it gray, that's fine! One of these days I'm gonna do a Tiger II with Porsche turret in gray, just cuz I think it looks cool!