Um that case according to specs, does not support atx board mounting, so you may have a separate issue there (ie the standoffs may be in wrong places).
Besides that, technically, you could just leave the PSU outside the case and run the cables through empty PCI slots on the back. Don't know if they'll all fit though.
Other way is to leave the top cover off and just run the cables out that way.
Or you can mod the case with an opening for the cables.
Just make sure your PSU cables are long enough for all this.