SH3D is probably the easiest option you will have. And it is certainly possible to design a factory / warehouse. Starting drawing is not difficult (much easier than some of the alternatives). Several threads in the forum has discussions about various tools and furnishings that might fit.

The only way to find out, I guess, is to try. While SH3D may have some limitations compared to commercial packages, the forum will usually help provide solutions if you have trouble finding out how to do something.

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