Well a hacksaw isn't, but an electric miter saw with a metal cutting blade is. I've done it before in my shop, it's fairly easy to get accurate results, especially if you mount a jig so that you don't have to measure the cuts. You could get a cheap miter saw for under 100 bucks and a metal blade is less than 10.... considering how expensive it is to get metal parts made it might still be the cheaper route.