Real candies are mostly metal, not plastic. The only plastic is basically just various trim pieces around the monitor and control panel and usually the marquee holder.
Most candies are pretty easy to work in. Some split down the middle as shown above, while others just have access panels and doors...everywhere. Most have monitors that are readily rotated and remounted without any real work aside from manhandling the monitor (kinda unavoidable unless you do some sort of auto-rotate system which is really only ever seen on home-use stuff, though I'm sure somebody will prove me wrong on that one).
They're also surprisingly lightweight. Metal is heavy, but you don't need very much (it's something like 1/16" sheet steel) to make the cabinet quite strong owing to the structure formed by the enclosing the cabinet. Getting the same level of structure with wood takes quite a bit more material (3/4" ply or particle board was pretty standard on American stand-up cabs from around the same era i.e. late 80s and on, though MDF seems to have become popular recently).
I have a couple Neo 29s and I love 'em. Many people prefer the newer styles, but I like the somewhat more boxy (yet beveled off) look and the glass over the monitor face to save it from scratches when it was on public duty. The front glass is usually just a bit tinted to help with the black levels, too, which is nice (I'm a video quality stickler).
Mind you, I like my good ol' Midway MK2 cab plenty, too. The standups seem better for a lot of classic American games: sports games, action fighters, etc. as they seem to heighten the experience of action and emphasize the social aspect by encouraging frequent rotation of players and bumping into each other. Candies are great for traditionally Japanese games requiring precision and control or with slower, more methodical like many shooters, tech fighters, some puzzle games, etc. since your body is more relaxed. Kinda reflects the corresponding culture to some degree, but then maybe I'm overanalyzing things...