Ct.
Being an avid BSG fan i noticed while i was watching season two tonight , that the canopy's on vipers slide forward to open and seal sliding back against the hull, when i gandered your model last night it appeared you have a hinge on the upper back of the canopy you have modeled. It didn't click with me then, but it did tonight watching the show with the wifey..
Just a thought bro.

G-man