Well, you could look for those old Revell sub kits. They made a cut away hull Type VII U-Boat, and a Polaris Missile sub w/interior long ago. I think some of the new large scale U-Boat kits such as the one by Trumpeter also have interiors, but are not cut away type displays.
Sort of like those visible kits of yesteryear like V-8 engine, Apollo Capsule, or Phantom Mustang, that are no longer in vogue for modelers. Aside from a couple new tool AFV club tank kits.