Hermit, that half moon on the back allowed me to use the existing pedestal guard which is the same height as yours. I second Ed's comment about the offset and taller guard making it quite a bit easier to mount the electronics, but since I wasn't going to spend the money on the navpod, I certainly wasn't going to get the new pedestal guard, call me cheap.
Speaking of cheap, I bought my C80 display on ebay and after the transaction, I concluded that it was probably stolen. With that in mind, if you look in my photos, I added a theft deterent. It's not Fort Knox, but it may be just enough to make a thief find another, easier target. Something to think about when building your own.