Anyone care to explain the control rods please?

I would appreciate some tips on tank installation on the extra. I'm using the YS so it doesn't have to be right behind the firewall.

I've finished the tail, including covering all the bracing and fairing. I'm not too good at that but I guess it's passable.

BTW, how do you get to the inside to do ANYTHING to the landing gear mount??? I can't even see it! I did mix some epoxy and tried to brush it inside, yet I'm not sure I even hit the right spots. I don't want to remove the covering to get at it. I guess if I tear the gear out, then I'll fix it stronger.