Modellers wishing to pose their T-33's canopy open should be advised that there is a large bridge structure and hydraulic ram between the cockpits as seen
here. It appears to form the bottom of the D-shaped internal frame Rowan mentions in the review. If you want the cockpit open, you'll have to do a little surgery to that frame, uness of course your aircraft was one of those equipped with the full frame.
Or if Platz' promised update set includes an open canopy option...