I used Hitec HS 225MG servos on ailerons, HS85MG's on both elevator halves inserting to the modified rear side of the fuselage,HS 225 BB on throttle and Futaba S 9252 on rudder/pull-pull. The engine was YS 63S with stock muffler. Dry weight is 2270 gr and the model flies better than my friend's OS 50 SX Ring powered and standard servo equiped Osmose. I can advise this setup for this model...The stock elevator pushrod system is not suitable for the pattern plane because it is not accurate.Elevator pushrod is flexible and too heavy...The elevator servo hole modification is very easy.You must cut two holes with the same size of the servo outer dimensions to the rear of the fuse,one hole one side and one hole the other side.... Best area is bottom of the stab. Carefully measure the servo dimensions and mark lines to the fuse and cut holes...Servos located one on the top of the other not successively...Servo horns must be same axis line when looking the upper view for the equal precission movement...I will search photos from my archive and will attach...

I recommend the thin CA apply to the all film joining lines.I'm using insuline injection needle attached thin CA .The covering is chinacote and not resistant to the fuel. Insuline injector needle has very fine pipe and useful for applying thin CA.After the CA dried the fuel can not disturb the film. Other way is using the clear nail polish for this situation...But it is not strong and YS fuel easily disturbs the nail polish...

Hope I can explained...

Best Regards

Mehmet ARCASOY