After dinner I installed the air valve and servo for the retracts. Added a restrictor to the out put of the valve to slow the gear operation down a bit. At normal operating pressures the will slam up and down.

Next is a dry fit assembly of the airframe, all servo leads and air lines pulled thru and hooked up.

Set the end points for the retract servo & tested out the gear and all threework!

A dry CG check, with gear up, places the Rx battery under the fuel tank.
Gear up because the nose gear wieght shift aft.
With this plane not much weight (foam tire and wire strut)or moment (length of strut).
But on a much larger plane or jet you woud have several ounces at 3.5" or more moving the CG.