I agree with dog about the rigging
. It is not a hard job to do yourself if you start with slightly long stays and shrouds with the top end swaged. The Hayn HiMod are easy to use and better for the bottom end than swages.
Wiring is easy with the right tools and a bit of planning. The b*tch is the access. Sometimes a simple wire run can take hours depending what has to be removed to get at it. Those hours can really add up if you are getting it done prefessionally. Most of those paid hours are not for electrical ingenuity. The link dog posted is excellent and really all you need to do the job right.
Also on that link is the best through hull how-to I have ever seen, step by step with lots of pictures to guide you through all aspects of the job.
Compass Marine Project Articles Photo Gallery by Compass
Marine at pbase.com
The first 3 relate to through hulls.
Caprail? Depends greatly on what type.