Let me give you some food for thought without sounding like I'm raining on your parade. I'm not saying what you propose can't be done, because it has. But there's a fine line between "can be done" and "should be done" when it comes to your safety.
1) 58" is SHORT for what I presume is a 28" draw if the bow is unbacked (it's short even for a 27" draw.) With a working handle you might be okay, but working handles are difficult to achieve with a pyramid design.
2) Being so short, the thing will stack like a pile of pancakes without flipping the tips. However, pyramid bows aren't really good candidates for that.
3) What type of wood are you using? I would really only consider hickory or osage for such a short bow, and even then I would back the osage with either bamboo or sinew. (I would leave the hickory unbacked as both sinew and bamboo can overpower it.) I wouldn't even attempt the bow your describe using any of the woods commonly found at hardwood stores/home improvement centers (with the exception of hickory). It's not worth your safety, or that of those around you when you shoot it/string it.
I've built plenty of short bows, but only if the person I'm building it for has either a short draw or a true need for a short bow. However, they're much more finicky, less forgiving, and require extremely good tillering.
Best of luck either way.