mgshightech:
If you put a blocking diode in there, you are dead. In my opinion, forget the blocking diodes, just have your controller turn the panels off at night. Relays suck power for their coils, but only 1-2 watts for 60-120 amps of current capability. That is a lot less than losses in 60 amps of blocking diode. (like 20-30 watts)
Take another look at Tim Nolan's project to see how he uses mosfets for the blocking. More generally, he really does a great job of explaining his circuit and the various sections of it.
I agree with you on dropping the buck/boost for simplicity. Assuming the panel/turbine and batteries are matched well the batteries won't care too much if you overvolt them a little so long as you keep the current within bounds (or is that saying the same thing?). An enduser can always pop on an external module for buck/boost anyway.