I added nosewheel steering today, with a control arm soldered onto the strut, fine cables running through aluminum pipes to the rudder servo, two wire whiskers to center it as it retracts, and rubber bands to keep the cables clear as the gear retracts. In other words, totally conventional.
I also fixed the carb. Turns out the grub screw that holds the throttle arm into the carb vibrated loose, hence fuel dripping from where the arm went into the carb, and the barrel not opening properly.