I don't think that money is much of a problem for Iran specially since sanctions r loosen up.
But there r LOTs of other things that might go wrong while building an AC.
For example India's IAC 1 development got delayed bcoz Russia refused to provide Special Grade Steel n in the end we had to come up with our on High grade steel for IAC.
Another important thing is long range n powerful radars along with mordern SAMs.
N most importantly an AC is a sitting duck without a powerpack CBG.
Anyways Best of Luck to Iran