Since I'm notoriously bad at explaining stuff related to my hacks in .TXT:

I popped the lid of the intended victim and took some piccies . . .



plenty of room for the HDD below the Zip Drive, I had to use a 1.125" Paperback as the support . . . the HDD was too short.



Rough fitting wasn't rough at all, it looks like the PCB may fit inside the Chassis with the opening as is . . .

. . . may need to widen it a scootch to make room for a thin plexi side panel so the HDD remains visible . . .

obligatory oblique views:





. . . looks good from where I stand! [] ]'>