Oh I have no doubt that it is possible if one is willing to put in the effort but you don't conjure up a nuke out of thin air no much how much you sweat & bleed ! It requires a proper industrial base for that, extensive technical expertise & years & years of refining them before you can even conduct the first 'cold test' ! Pakistan began her program in the '70s & it took us more than a decade to be in possession of a nuke.
Then you've got the delivery mechanism as well to worry about !
What I'm trying to say is - Its a fairly time intensive process & Iran is already on the cusp of making a nuke whereas KSA hasn't even begun.
Does that include me too ?