how about the down and right thrust for the engine ? Is it build in the firewall / engine box, or do we have do this manually ? Just wondering so I can see what engine stand offs I need for the DA 50.

OK, my servo choice is set and purchased :

Ailerons: JR 4735's
Ruder : JR 2721
Elevator : JR 2721's
Throttle : JR 531
Choke : JR 531

Do not trust Hitecs servos for this Baby due to some centering problems I have had in the past.
With all those High torque and high speed servos I might use two 1650 NIMH 6V batteries for radio operation, and either NICAD 1800 mah 6V battery for the ignition or a NICAD 1100 mah 4.8V depending on how it will balance.