The stabilizer is supposed to be a symmetrical affair both on the model and in full scale. If it was built correctly, there should be no difference which side is up or down. If your stabilizer turned out to have one flatter and one "more rounded" side. then I would follow the suggestions previously mentioned, but with this unintended configuration you can expect some interesting flight characterisitics. If the rounded side is on the bottom (as has been suggested for appearence), you can expect the effect of a mild "up elevator" command which will increase proportionally with the speed of the airlane. The reason for this is that the more rounded bottom surface will cause a negative lift condition pushing the tail down as the speed increases and therefore pointing the nose up.

This is a challenging kit so perseverence from you will be required, but it does build into a very impressive looking airplane. I'm currently building mine with lots of modifications and having fun adding gobs of details which will take lots of time, but this is a perfect kit for a super scale project.

Good luck with yours! I think you'll be very pleased with the Skylane, particularly if you appreciate scale.