Wind that plane looks like a good choice for a trainer. I learned to fly on a Little Stik with an OS 25 on it. Small bore engines can be found on Ebay all the time. Getting them shipped to Italy might be the problem. Here is a link to a similar .25 sized plane. I have one of these and my buddy is building one. They are light weight and can be built in a weekend. Mine flys very well and is stable enough to be a good trainer.

http://www.bridiairplanes.com/hangar/aircruiser25.html

Here is mine with an extended wing for electric flight. I decided electric was too expensive to get into so found a new in bax OS FP25 on ebay for $35. Thats the good thing about small motors. No one flies them much anymore so they go cheap.