Welcome to MobileRead Simon
Check out the Wiki. (Link at top of page.) There are a lot of tips here on creating MobiPocket through Mobi Creator (considered the best method) and BookDesigner (good, but I am told that Mobi Creator is better.) I have created hundreds of ebooks using BookDesigner; however, I have seen the dramatic improvements in the ebooks that Harry has produced in Mobi Creator vs. the same books created in BookDesigner.
Your three titles sound interesting. I enjoyed reading the tips.