A few years back, I started on this weather station project while at the Tokyo HackerSpace (in our FIRST location). I had grand ideas for the project, but also knew I would likely have a few failures and re-designs. In my assessment, most of the sensors would be easy. Most of the sensors are 'digita' in nature, have no mechanical parts, and I have used on their own several times. The only challenge would be integrating them all in software, and building a suitable case for everything.