Im making a factory schematic for walls. Shouldnt 99 be the most walls I can make, after using 10 of the 1000 structure modules to make the wall schematic?

In every case but walls, that would be correct. However, the wall schematic calls for 10 "simular" structure modules, not "identical". This means that any ten structure mods will do, regardless of their serial number, whether they were made in a factory, or by hand. Also, any schematic that uses structure mods, or walls, (houses, factories, harvesters) calls for "simular" structure mods or walls, not identical. So, as long as your resorces hold out, you can make upto 1000 walls using 10 or more schematics for structure mods. This is what I think happened. When the devs came up with the idea for factories and requiring "identical" factory run componants for advanced schematics in each crafting profession, they came up with a "chicken or egg" problem. That is, how could an architect make a factory if he needed factory made walls to make one? Their answer seemed to be to make walls, and the structure mods that make walls, not requre a factory, thus the "simular" versus "identical" for ...  more