Personally I stack rocks right on the glass before the sand is added. Use your biggest rocks at the base, regardless of dried vs cured/uncured, big stuff at bottom on the glass. Once you have enough rock at the bottom add the sand/substrate and move it around the bottom rocks to suit your taste. After that build up the rest of your rocks to suit you. If you build something you like, wiggle/push it around (carefully) so you can get a feel for the stability of the stack if it seems like it's a little unstable move it around till it seems solid.
Since you have uncured rock you have at least 2-4 weeks before you should add any livestock (make sure you understand what you should test for and DO IT, no sense wasteing money and critters). The cycle time will give you some time to look at the settled tank and decide if you want to change the aquascape. Dont spend 3hrs trying to get perfection, create a stable aquascape and give it a day or two of observation to see if you like it, then if you dont try again, it's art not science, YOU have to like the results.
You can use acrylic rod or pvc if you wish, but usually it requires that you drill the two pieces of rock that the rod/pvc is holding together. You really only need to go there if you want some crazy structures in your aquascape. Otherwise look at a ton of tank pictures and see what aquascapes grab your eye and play around with that style, you wont duplicate anything you see, in fact I have never been able to duplicate my own aquascape with the very same rocks!!
Above all, don't rush the process and keep the rocks far enough away from the glass so you can clean the glass without undue hassle.
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