That skimmer won't work. Water is going to pour out of it on the left side.
The pump should work out nicely. Someone asked on the previous page how to plumb it. This is my thinking. Run 1.5" plumbing (SpaFlex and/or rigid) as far as you possibly can, then reduce at the very last second before it enters the bulkhead. If you want, increase the plumbing inside the overflow back to 1" right after the bulkhead and then reduce it again at the top where the locline probably is.
By keeping the plumbing large and avoiding as many elbows as possible, you'll get the most flow out of the pump. Try the bulkheads will be a bottleneck.
The other option would be like another poster suggested, in making all the plumbing be drains and having two return come up the back of the tank and over the top lip. If that is the case, again keep the plumbing 1.5 until you have to bring it down to 1" or 3/4".
And hopefully your sump will be able to handle that much flow.
The Tunze rocks, if placed on the sand, need to have the pump's smooth area (of the grill) facing down to avoid drawing sand into the impellar area.