There's a lot of different components which when put together right end up making a fully automated observatory. I don't think you're going to find an all inclusive answer as simply as it seems you're hoping.
Roll-off-roves can be automated relatively easily using guarage door motor mecahisms. I have looked at web pages in the past where the people take them and adapt them to astronomy purposes and sell them on, unsure on the details of them now.
Just about any observatory can be adapted to be remote, but it's usually custom to the observatory, after having learned what tact you want to take and then finding what parts can be adapated and working with that. You can take the tact of buying a complete system off the shelf from someone like Home Dome or Sirius.
Software Bisque products are easily integrated in to automation with cloud sensor etc using CCD Commander. In fact you can work from that end of the question - look at what components CCD Commander works with and buy/plug-in those parts.
Parking in case of errors and all that is fairly standard (and sometimes annoying), being 100% confident it's going to correctly work when rain clouds come over quickly as opposed to some other irrelevant error is more tricky.
Some resources for you to start building up the pieces you'll need:
http://tech.groups.yahoo.com/group/Observatories/
http://tech.groups.yahoo.com/group/CCDCommander/
http://www.homedome.com/
http://www.siriusobservatories.com/
A little info I once wrote about it:
http://www.rogergroom.com/astronomy/...ated_astronomy