As side note, remember that the baseboards are placed only on the sides of the wall, not on the ends. So, if you need to place baseboards where the wall gets thinner it is better to create a "loop". it is a bit hard to explain in words, but very easy to understand looking at the following picture. On the left side you can see how it appears in the "traditional" way, on the right side using the "loop". Once deselected the loop gets hidden, so it resembles to a normal wall.
