Here's my 2 cents...You'll only need 4 heads, one in each corner. Take out the R16 in the middle. You have plenty of coverage. The +0 will be fine with coverage from the R26 & R38 at the bottom of your diagram. There will be some overspray onto the walkway but I don't see that as a huge problem. Your elevation changes are not a big deal.

I agree. I'd loose the R16 in the center. You don't really need it. With some fine tuning of the radius of the other 4 sprinklers I think you'll be ok. And elevation is really a non-issue. With the application rates you'll get from the rotors I don't think you'll have any run-off problems. If you do, just drop back to lighter, more frequent applications during the irrigation cycle.