Hi.
I have x64 UEFI installing from WDS2012(R2) and MDT 2013.
If you are getting a time out, i would check your WDSUTIL.
Have a look at what boot program is being used when you EFI boot (opROM must be set to UEFI not BIOS).
From CMD or PS
Then look at this section:
Mine (for x64UEFI) is directed to the following:
Boot\x64\bootmgfw.efi