In my case first I found building material (previous article) for my house and just after I found my architect. Actually I did not have a big choice if I want to build from SIP. In Belgium is just one company who is building from SIP and luckily the company is located in neighborhood.
Here below you can introduce your self with my architect Jan Peeters and his company, also you can see other SIP buildings what they have build.
Family House in Belgium 