That looks awesome!
Check the dimensions on your coaming for the slots on the control board. I'm not sure why they have two sets there... the wider smaller set may be for mounting closer to the middle of the cockpit. I would pick a spot further forward myself... so you may only need one slot.
If your lee board has eyes in the ends those are for the jib sheets to run through. I like to use these so that you don't completely lose your line when you drop the sheet going from one side to the other. Put a figure eight knot in the line and that keeps it from going through the eyehole. That said, angling the clamshells on the control board to the angle of the line coming in from the eyes on the Lee board cross bar will make everything work a little smoother.
I like the idea of having the cleats on the board as they will be handy to tie your halyards to. However, I can tell you now that they will catch other lines all the time while you are making line changes and adjustments. I use clam shells and plan to put Harken guides out in front of them or on the Lee Board cross bar to keep the angle lower.
I tried to figure out a way to mount the Hobies on the LB cross bar but it was too complicated - the bar hits the lee boards...
The tube in the Hobie system should be slotted for a variable fit on the Kleppers. I drilled my holes straight which means they only fit in a small area of the coaming. The good thing about that is that the fit is tight and the J bolts stay vertical. They don't start pinching and angling as you tighten them. -- This makes me think that a series individual holes on the control board might make for a better fit than a slot... -- The angling that you get from a slot always ends up loosening in my experience. I now use large washers to help prevent this but there is still some angling. Don't forget to take the male/female connection equation into consideration before drilling the holes in the Hobie center tube. I do have to say that the single hole method is a really great tight fit. Honestly I wouldn't mind having my Lee Board fit like that.
Another thing to consider is leaving space for a compass on the control board.
Here's a shot of mine, the black square to the right of the mainsheet clamp is for a compass:

The three forward facing clam cleats are for the sail tensioning. Typically the two on the left are for the jib - one for the halyard and the other for the jib's tack at the bow. I keep the jib on a continuous loop so I can deploy and retrieve it easily while underway. There's just enough slack to stow it comfortably in front of the mast under the deck. The clam shell on the right is for the main halyard.
Underway - you can see the Hobie cross bar mounted and ready for outriggers if I need them:

You can sail the S2/4 rig without the outriggers. The BOSS system is great, but the Hobie system can be easily stowed or deployed while on the water. They will allow a capsize if you have a pretty strong blast and are asleep at the wheel though. I never capsized with them but I think I came pretty close once when I was reclining while sailing... no counter weight... scary moment and scramble, ha.
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