Hello Richard,
As Glen indicated, RS is the one to go to usually if you are looking for movie accurate commission built.
Ross (RWA) and Paul (TROOPERMASTER) , both from UK, also take on commission too, if you want an option beside RS. Look them up in Facebook and ask.
Here on the forum we have some wonderful build threads on both of them too, just head to the ANH build section and see for yourself.
Good luck and have fun.