The case is a little less than 7 inches wide, so assuming that the new PSU is 10.8 inches long, 4 inches high, and 8 inches wide, it won't work because it's too wide.
That's a damn wide PSU though, but 4 inches wide and 8 inches tall doesn't sound right either.
Dimension: W160 x L150 x H86 mm
is the proper dimensions straight from their website.
What would that convert to?