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I believe mainline should be 1". 1/2" is way too small for laterals as well as 3/4" PEX. I think you should use poly pipe for laterals given you are in freezing climate.As far as size goes there's calculations at irrigationtutorials.com but I will be using 1" poly. I have essentially similar static pressure, GPM and supply pipe size.
Does flower beds require the same amount of water as grass?
This one?Don't have to use funny pipe but it makes an easier install. Toro also says that it cushions the heads in high use areas.
As far as the flower beds, if they are mulched any extra water won't cause erosion.
PVB is a good backflow preventer, double check valves aren't. IMHO. If you can install a PVB use unions so you can take it in in the winter.
Thanks, I don't have other place to put the PVB, garage is the best place for me. Will it be ok I blow out the water from PVB every fall? Still no good?PVBs are expensive and I would not leave it in the garage unless it never freezes in there.
As far as head placement my design on paper didn't relate well to reality. And once I finally settled on a plan, I needed to make a couple adjustments once all my heads were in. But now it's great.