They do make them twice as wide, and deeper, and taller, and shorter... that's actually a nice size, in that they're easier to stash wherever. I've got a couple wider ones that are kind of stuck where they are, because that's the only place they fit (but non in the shop)
I think I need to remove a couple of the miter boxes from collection. I've had 3 sitting inside on the floor in the mudroom that I've not touched in 2 years. I got an all-steel on a stand last year that's been the main workhorse in the shop. I just hate selling mitersaws anywhere other than locally, because they're a pain to ship (just ask the Keen Kutter box that was broken twice in shipping it to me :( )
And no, Kenny, the 15-1/2 is not one that's slated to go away lol