Romulo: For this aircraft, digital servos are not a must, but they give you a more presice handeling. A good quality analog servo should be more than capable!
I would use 3-4kg on the ailerons, 4-5kg on elevator and 5-7kg on rudder. The throttle servo should be a quality servo able to withstand the engine vibrations! I'm trying the Futaba micro-servo, but I am a bit curious if it is up to the task... Maybe I'll add a bit of anti-vibration in the servo-assy.
Also, if I'm not mistaken, the plane is designed around the Os70 (hence the name Osmose70), so your engine would fit in perfectly.

I got a box from Central Hobbies yesturday, so it was almost Chistmas for me! Did not have time to do too much though, but found out I forgot to order an adaptor for the TruTurn spinner (The Norwegain taxes set me back approx. $150 on the shipment (tot. of $500 from Central), so I will find a cunning way of getting back at them somehow...)

The Hyde mount gave me a 210mm distance between firewall to the spinner backplate. The instructions on the plane states 180, so I need to tweak the cowling a bit. Everything went together perfectly (Thank you Hyde..), so now the engine is in place! It is really tight to get the self locking nuts into the back of the firewall, but after a bit of svearing and sweating it came through.
It looks quite cute actually with that tiny Hattori header and pipe!

The stab is also in place, so I'm on a roll.... Will not be able to do too much the next couple of days, but once I get out in the workshop I plan to get quite a few things done. The box from Central was full of "things I did not know I could not live without", so everything should be there to complete this bird.