To answer couple of the questions on the P-51 B model
canopy I have gotten, I take a standard P-51D canopy and since the front shape on both is very similiar I cut the back half off and build the frame around the front section with styrene plastic strips. I use the measurments on the P-51 D plans to determine where to make the cut.
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??????? above is a copy/paste from
http://www.rcuniverse.com/forum/m_8222802/mpage_1/key_/tm.htm