door latch on the door 10 after the thermoforming process portions of the sheet stock are cut and the door 10 is then trimmed to form the apertures the inner skin 12 and outer skin 14 have a final target thickness of substantially 3 8 mm but it is within the scope of the invention that other thicknesses may be used depending up on the application this is part of a routing operation applied to the door 10 in this embodiment there is a first aperture 26 cut out of the door 10 as well as a second aperture 28 and a third aperture 30 cut out of the door 10 surrounding the first aperture 26 there is a first inner flange 32 which is melt bonded to a second inner flange 34 during the thermoforming process to form another melt bond 20 similarly surrounding the second aperture 28 there is a third inner flange 36 which becomes melt bonded to a fourth inner flange 38 during the thermoforming process to produce yet another melt bond 20 once the door 10 is formed and the skins 12 14 are bonded together windows generally shown at 54 are attached to the door 10 the windows 54 have a frame portion 56 and a window pane 58 the frame portion 56 is attached to the door 10 through the use of any type of suitable fastener such as a bolt rivet or the like in this embodiment there are a series of bolts 60 which are screwed through the frame portion 56 and the flanges 32 34 in the first aperture 26 and through the frame portion 56.