Hydro Junkie

And while I do agree with most of what B2B said, I'm going to throw a bit of caution out on his last comment.
Building light is good. Keeping weight down is almost a requirement to have a plane that flies well.
Building straight is also good. A plane built with a twist or warp in it will not fly well and may lead to its premature death.
Build it strong, however, I have an issue with. There is a big difference between building strong and overbuilding. This is where many new builders get into trouble. Building a strong plane doesn't require adding a lot of re-enforcing or added bracing. This is where an instructor with building experience can be beneficial. Where you might want, for example, to add a large fillet or a larger than called for glue block, an experienced builder may know of a better way to strengthen an area without adding a lot of weight.