The wing is 212mm wide at the tip (measured at the tip of the aileron) and 460mm at the root (measured along the side of the fuselage), which gives a ratio of 2.16.
I think 3:1 would probably be too much.

The weight of the fuselage including the rudder, canopy and cowling is 1250g. I know it's probably on the heavy side, but it's the best i could do with regular balsa sheets. The canopy and cowling are a little bit heavier than i expected (110 and 115g ) but i'm going to use them anyway. Since it's my first 2m model, i have no idea about the final weight at this stage. There are a lot of experienced builders here, so i'm looking forward to hear your opinions about this.