Best bet is to start getting installers round, ask them how they would do it, and how they deal with reveals, gutters, downpipes, SVPs, window sills etc.
You'll probably find that mostly they do things their way, and that's it, but if you like how installer A does thing X but otherwise want installer B then ask B to do X.
Make sure you fully understand these systems before you start planning the install. Many have been poorly installed and are starting to fail prematurely though there's no reason they shouldn't last 25 years so long as the install is properly managed. My advice would be to choose enhanced polystyrene insulation and to make sure it is glued and mechanically fixed. I wrote an article on these systems for the Construction Research and innovation Journal that you will find here...
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