The wing sections will be bonded together and additional tightened end-to-end by an 8 mm carbon pipe. The 4 mm holes are only for adjustment.
With 14 wing parts and two wing centre sections you will reach 1370 mm wingspan.
For printing use 1 perimeter and about 8% infill or rather less.
I don't know when I will continue the rest of the plane. In the meantime it would be great if anybody else looks to the fuselage or the tail unit. Or make some suggestions?

Edit: 13.01.2013
I added new parts as follows:
wing_90_infill
tail
fin_145
fin_rudder
fin_rudder_mount
horizontal_tail-middle_right
horizontal_tail-middle_left
horizontal_tail_ outside
horizontal_ rudder_ right
horizontal_ rudder_ left
horizontal_ rudder_ outside
horizontal_ rudder_ mount

At the beginning I planned to design the plane without motor and RC. In the meantime I think I should go a step further. But that brings some problems to place the servos, motor and RC. Probably I have to make the fuselage bigger. If I get the components I will see.
I hope it will not change the tail because I have it ready together with the complete tail unit.
Another problem is how to split the fuselage in pieces so most can print them. The current tail is 145 mm.

All fin parts have holes for to dowel them together. 2 mm for 1.75 filament and 3.2 mm for 3.0 mm filament. These are only for adjusting. Of course additional they must be glued.

The inner horizontal rudders and the fin rudder have support on underneath its mounts. The inner ring on the frontside of the tail is also a support. These must carefully break off or cut off afterwards.

Before fitting the horizontal middle fins to the tail you must remove very accurately the jutting edge of the first layer. Especially the inner nooks of the vertical nose have to be file off carefully.
Then the horizontal fins will fit exactly and tight to the tail and you almost don't need rubber bands for fastening :-)

The tail and rudder parts I printed with 0.25 mm layer height, 1 perimeter and 0.025 infill.
The rudder mounts with 0.2 mm layer height, 3 perimeter and 0.5 infill.

New wing profile
To save weight I designed a different wing profile with infill structure (wing_90_infill.stl) But there is one difference: the 4 mm hole is now 4.5 mm more backwards. This became necessary to bring the perimeters of both together.
Attention:
Please be aware that the small holes of the two different profiles will not fit together.

The next 7 weeks I will not have an opportunity to work on it. So don't expect any progress in this time.