It sounds like you just want to read Static HTML pages on your Reader. Have you looked into BookIt. This is a firefox plug in that turns a web page into a LRF eBook?
BookCreator is not really designed for creating ebook from different sources. Neither is BookDesigner.
If it is one book you are trying to create building it from multiple web sites. I think the best took is MobiCreate. Here you can load many different files into one OPF project. MobiCreate then turns them into HTML.
Once you have your eBook you can use Calibre to create the LRF book.
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