Cedric,
First, the plans are available through the Smithsonian
on microfilm. That said, the nine pages of drawings
for 15-7360 encompass the assembly of the stinger
tail gun. There are 100+ more drawings for all the
miscellaneous components and pieces of equipment
that are part of the enclosure. On top of that, unless
your friend is into sheet metal, you will find some parts
(the yoke for example) difficult, if not impossible to make
from the drawing. Refer to some of my earlier posts about
the tail gun for some more detail.
http://aerovintage.com/forum/viewtopic.php?t=413
http://aerovintage.com/forum/viewtopic.php?t=408