There was a thread in the ARF/RTF forum where an indevidual asked for pictures of the front end of an Arrow for reference to rebuild. The picks may be helpfull to you as well. Particularly where the cowl cheeks are cut down to facilitate the needle valve assembly of the engine. Here is a link to that thread if you care to look.

http://www.rcuniverse.com/forum/m_71...tm.htm#7148785