Sometimes it can be worthwhile to make transparent parts yourself, as they are much thinner and thus allow a distortion-free view into the interior of the cockpit. But be warned, practice with an old canopy, because this method can cause damage on your canopy.
Safety advice: do not use candles near paints or solvents!
1.) Practice with different plastic sheets from packages
Heat the plastic sheets evenly over a candle flame and drag it over an old canopy, just to see how it works.
This is important because your original canopy can be used only 3 or 4 times as a template before it may damaged!