Hi I used nelson hobby piano hinges for the doors and used mid mini servos whith a door sequenser a lot less hassel than air the gear are spring air I wood up grade to strutt capable spring airs the kit you will get will need some modifacations I used a special torque rod set up and this plane was ducted fan it was built before turbines were a every day thing so I figured to keep it ducted fan I did install intake ducting and changed a few things my freind did build a turbine craig kit flys great we will fly on thursday and post some pics!