Here in the states, lots of guys know Jake Raby as the leader in the Type IV market. While the guy has a huge superiority complex, he is good with Type IV VW engines. The guy knows a lot more about engine building than I'll ever know, he rubs me the wrong way with his posts on the various forums. It's like he thinks he's Gene Berg or something.

I have never heard of a complaint about his work, other than he is NOT cheap.
With the high cost of going Type IV, and a limited selection of parts why not build a 2 Liter Type I like Greg did here on this site? See this thread:
http://www.german-pride.com/Joomla/index.php?option=com_smf&Itemid=63&topic=56.0Good luck with your project regardless of which way you decide to go. Will you share pictures?

André