If Mr. Irwin is no longer active publically re: guitars, making dishonest or liberal claims about something being his work have less risk of being exposed or challenged legally unfortunately. In this respect, especially considering the collectability, reputation, and demand, he may be an especially ripe target for miserable scammers.
Those pickups are interesting too. Could they be early Alembic? Parts of the guitar appear rather blocky to me, yet others refined. I would bet against it being Irwin but I haven't even held an Irwin guitar; thus it isn't even an opinion, but merely a guess.
I was commenting on the 1st pictured guitar with rosewood fretboard and skunkstripe. But I just realized the negative space guitar resembles the figures that 1980's SoHo artist used to do...they were everywhere. Keith Haring. Its like one of his figures jumping for joy, especially from the back. Wonder if he was an influence for it, or if it is just coincidence due to the use of negative space.