PSU and Mobo fitting

Looking at this case for my new rig:

and trying to see if this will fit in:

I’m guessing this line in the case description:

M/B Form Factor ATX (up to 12” x 10.5”)
Is the size of the mothor board it can fit?
If so I’m looking to put a Gigabyte Skt939 mobo in there

Probably a

from what I can see it will fit seeing as it’s form factor is ATX as well…

any help or feedback?