I will check the exact dimensions of the ssd drive.
There is some sort of bracket in the PB 12" for the hard drive and perhaps I can squeeze enough room with a normal sized SSD drive in there, with tape instead of screwing it down into the bracket. Who knows, maybe this will give me a slight edge in speed I've been looking for on the PB 12" since 2006 when I bought my first one new.
Or I could probably beg Daystar to re do their PB 12" CPU upgrades if I felt like spending the money. With an SSD drive in there, the heat issue becomes less of an issue on the CPU upgrade.