FWIW, I think that cab is perfect for arcade shooters (a local op recommended it to me some years ago and he was right). It's a 25" screen, which is plenty big for most arcade shooters. The fact that the pictures are outside and shots are being taken from 3x the distance you would see in an actual arcade shooter make the unit look smalller than it is.
This isn't something I would ever even consider building or buying, but there may be someone out there who says "Brilliant" and submits a generous best offer, so best of luck to the seller.