Good luck with the fuel pump rod. Hopefully it will come out in one piece!
With the HX I found the gap with mine was less than yours, but I was still surprised when I first saw it. I managed to connect it to the exhaust pod by just loosening things off a bit and then the wide collar bridged the gap of about 5 or 6mm.
Gearbox looks great, I'm hoping mine looks a lot better soon.