Hi Wooly,
I'm considering the same motherboard.
It doesn't have video out, so you wouldn't be able to use IGP on your i3.
I assume you put a graphics card later in the build (can't see it in the pictures you posted, but can see a monitor with test output :)).
After you finished testing, did you leave the graphics card in the machine to allow it to boot, or did you remove the graphics card and run headless?
I'm not sure whether Asrock e3v5 WS will boot without a graphics card and whether FreeNAS can boot and run without it (or can "see" the i3 IGP with C232 chipset).
Appreciate your help.