Here's a side view showing the throttle servo. The micro servo is attached to a balsa spacer with double-sided tape. The spacer is glued to the firewall. The red standoffs were purchased from [link=http://www.aerografixs.com/]aerografixs[/link]. I laminated 1/4 aircraft ply with the outer layer attached to the standoffs then glued to a second layer to recess the bolts. I used two vertical strips each about 1/2 inch wide.