the modular system

A system of sophisticated castings that can be easily assembled to create larger buildings and models quickly and inexpensively. The basicstones are numbered from 1-10 and have the same dimensions for all surface structures. The vast majority of moulds are generally suitablefor all scales from 1:19 to 1:25. We have a few that are special for other scales. For these shapes the scale is included.

Here isfurther information:
detailed field report by VolkerSchnurr
Introduction with 5 simplebuilding instructions
Construction manual for 12 more buildings
Instruction in English!