In truth, not really. Although not too heavy, they are not as light as custom constructed modules [EXAMPLE]. Although portable, they won't fit into smaller vehicles.
Their big advantages though is that they are a sturdy pre-constructed surface (easily covered with low-pile carpeting) which can often be found used at a very cheap price. Dimensionally a single door is just big enough as a module to hold an interesting O-scale stand-alone trackplan. If you don't have access to the tools/space needed for custom module construction, then an interior door module (perhaps just resting upon saw-horses) might be a viable option.
The below examples of purpose oriented interior door modules were designed using Atlas 21st Century O-scale 3rail track in SCARM (files included). To keep construction costs down, a minimal number of turnouts were used. The track plans intentionally incorporate semi-toy animated accessories and cars into their design (see: *.pdf), in order to show that even the uncommon and odd-ball cars of Tinplate 3rail Modeler Railroaders can be given justifiable destinations. Although trackwork and building footprints in the *.scarm trackplans are drawn to scale, the building and accessory graphics are rendered in simple block-form without any detail. Where actual Toy buildings and accessories are indicated however, they are dimensioned upon actual (but frustratingly often underscale) plastic toy train structures.
Air Express Transloading
Antiquated Urban Light Industries
Compound Ladder
Double-ended Staging/Fiddle Yard
Fantasy Missile Proving Ground
Fantasy Suburban Firefighting/Rescue Services
Island-style Rapid Transit (live third rail traction equipment) Station
Rural Coal Mining
To accommodate a return loop's wide width, these modules (left side loops illustrated) turn the interior doors 90 degrees. A set of at least three doors are required to form the integrated module, but the doors lengths are trimmed down to follow the front edge of the loop. The entry point returns to a 30" width, so that they can be directly connected to a standard interior door module.
Full Service Passenger Facility - (more suitable to O-27 rollingstock)
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