Website design tends to be a natural progression for all of these fields, but it can also be one of the least profitable. The scope creep is a constant struggle, and you will have many discussions with bad ideas. The right business plan and contract will save you from the complications, but definitely something to consider. I've been doing this for 10 years, and have built over 10, 000 pages, but I have only personally built a handful of websites front to back. Each time I do build a site I am reminded why I don't do it more often.