Great photos. I wonder which came first the Mannock or the Woz. Unfortunately Woz had very little to do with the Macintosh. In my opinion, only Mannock or Jobs deserve the front spot, with the posible exception of Raskin.
Except that it is the Plus, which Jobs likely had little to do with. It looks like the author of that picture felt the same way as you having them sign the bottom only. But he would have a hard time using that as a photo prop if the case were signed on the front and sides.
I understand your hesitation to "ruin" the hardware but it would definitely be the centerpiece of any collection.