jan-jaap wrote:
I believe it was on purpose, so you wouldn't be tempted to put a 24" monitor on top of it. Apparently some people tried that with Indys or Indigo2's and ended up with bent or cracked cases

One would assume that the designers, of a machine which tended to cost upwards of $10K when first introduced, would understand that their market was not made up of morons

(Alas, you never know I guess...). And a simple warning would have made it clear.
It would have been swell to be able to have stacked the CD-ROM (or external HDDs) on top of the O2 or Octane... just like the Indigo. Much less foot print... Plus making the Octane slightly taller would have given enough volume to include an internal 5 inch storage unit for a CD-ROM.
There were some mechanical design decisions in SGI-land which were truly epic in magnitude due to their stupidity. My biggest peeve were the drive sleds: I used to have a twin tower (alas, the two towers seemed fairly different in design and purpose so I never understood the monicker, but I digress) 4D, and the drive tower was so stupidly designed, why did each drive require like 10 liters volume and 10 kilos in sheet metal in its enclosure? When I owned an indigo, indigo2, and octane... I always wondered if SGI had a department whose only mission in life was to design drive sleds.
Each generation brought an incompatible drive sled, and an incompatible form factor for the GIO. The engineering resources for that must have been pretty high. Heck the Indy and Indigo2 were the same generation, yet they had incompatible form factors for their GIO implementation...