Was looking into something briefly and realized the tool I slapped together has the winding order backwards for what Blender expects. Made a minor
update to the export tool in case there is any desire to do the below.
In Blender there's a checkbox for backface culling under the "shadeless" option -- allows seeing the interiors of rooms in dungeons and such. Quick look at sleeper like that, with the final room prominent:
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And just for fun, the same view with orthographic projection (no perspective, like an old isometric game) which can be toggled with numpad 5 or View > View Persp/Ortho from the lower menu bar.
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