Yep - For large area's = Jigsaw
For tidying up afterwards & blowholes etc - Dremel.
For dremeling - ONLY get the reinforced cutting blades.
They cut through it twice as fast and last 5 times longer.
Really are akward if not using reinforced ones.
Looking good on the window though - I usually use Silicone Sealant for the window... Less likely to crack when moving the case side about.
(As dried epoxy will be very rigid)