That's his own signature model from Carvin (called the fat boy)

Allan HOLDSWORTH is a legend among guitarists. Even if his music is weird (trust me, you get used to it, and once you learn how to appreciate it, it sends shivers down your spine) Satch, Van Halen, and lots of others think he is the greatest guitarist to ever walk on earth. I have put this link here because I know he isn't very famous even among guitarists, but he sets standards for tone, phrasing, and sheer technique (he blows away all the shredders and all the guys whose name end with AI or NI, has you can see an this video.)
I hope I will turn some of you to buy some of his CDs, since he doesn't make lots of money like he should. He even considered having a day job!