Using RapidWeaver, I have succeeded in creating a basic website. I have two linked sites, one at CurvedArrow.com which has a sub-site phpBB forum dedicated to an organic chemistry forum. The other is a vestigial site I created with iWeb. This site is at CurvedArrowPress.com.
There were some programming problems that I was able to solve. First of all, because I didn't know how to create and link my other website to my organic chemistry forum site, RW enabled me to create that link with a sidebar structure. The iWeb site could benefit from the sidebar as well. I have succeeded to an initial extent. I wanted to maintain my iWeb pages and replace them with pages that are more general. RW has some advanced features that surpass the capabilities of iWeb. However, by having them co-exist, I will be able to cover the same material without being in an either/or situation.