Thanks guys, I am glad you like the wing but is not finished yet.
@Andreas: I used tolueno (or toluol) mixed with small clear bits (from canopies trees) applied with a flat brush (2 cm wide) to glue the skin to the wing. You have to be very careful because toluol is a very strong glue. You can "melt" the 0.25mm skin very easily. You have to apply just a thin layer to the skin and a thicker one over the core.
I used toluol mainly because its drying time is slower than regular modeler cements like Tamiya, Gunze or Humbrol giving you enough time to "conform" the skin to the wing core.
About the printing on plasticard, It was quite easy. I cut a 0.25mm plasticard sheet to A4 size and printed the drawings I made with Corel Draw with my old and reliable Epson printer. It uses an ink called Dura Brite designed for Photo paper. This paper has a surface very similar to plasticard. You have to let it dry overnight.
@Stephen: I do not like the wood core too. In previous builds, I had many problems using wood for the core: warping....skin lifting ..."bubbles" between the skin and the core...etc...
Because of that, I used plastic instead of wood.
I think Woodman's technique is faster than casting sections of the wing and with a bit of practice, you can get better results.