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Almost every bike I have owned has never had a castle nut and cotter pin on the front axle, but often did have one on the rear.
Granted, like I mentioned before, most of those bikes also had front axle pinch bolts.
A trick for getting a cotter pin hole to go straight and centered is to actually drill a guide hole through a hex nut and thread that over the bolt into the position you wish to drill the hole. The hex nut has flat sides with known dimensions, so you can mark, punch, and drill straight through the middle with ease. This will give you exact alignment with the bolt, and also stop the bit from deflecting off of the threads and the round surface of the bolt.
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