I have a very similar canopy and if for any reason I had to re-build it, it would be converted to a forward tilt, for many reasons. The turtle deck would remain the same. My method is very similar to Larry's, after all, he did it first, so I had something to go by.
See N64KR at http://KRBuilder.org - Then click on the pics See you Oct. 4 and 5, 2013 - KR Gathering in Mt. Vernon, Il ? MVN Daniel R. Heath - Lexington, SC