BMC Toys: The German Bunker of San Juan Hill

Work continues on restoring the recently located BMC San Juan Hill molds, but in the meantime, I'm considering offering the Inner Hacienda walls as a separate accessory this fall. The walls have been used by custom playset builders for a wide range of places and eras:

This got me thinking about how the walls might look with different roofs, and if a new roof mold might be feasible. The simplest design is a flat roof that transforms the hacienda to a bunker or commercial building. This flat roof is made of 2 identical pieces:

Each half could be removed independently for interior access or to simulate damage:

With the flat roof, units could even be stacked to make a multi-story building (just watch out for that first step, it's a doozy):

This is just a first concept, but I did get an initial quote on the cost to have the flat roof mold made, and it's looking like a real possibility. Who knows, if this works out maybe other roofs could be done. A wood shingled hip roof would make this into a great rustic building or a thatched roof would make it into a nice cottage. I think the flat roof would make a great accessory for the BMC Toys D-Day Playsets. Let me know what you think.

Tanks' for your help,