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You can continue on that thread with these questions since it's the same question (title) - although you're asking for information about building a model while your question title is again asking about building a process flow - which Phil has already answered and I have commented on. There are many topics on this forum about autobuilding conveyors, AGV networks etc. along with the Fixed Resource, non-module-based objects. You're probably aware that for the basic objects the commands createinstance, createcopy, setLocation, contextdragconnection are going to be the main ones to use and then you'll be setting properties and possibly variables too.

In the post to which you linked I said it IS possible to create process flow activities in that post using function_s commands - you don't need C++ module. The problem might be maintaining that, if/when changes are made to the module. BUT - you can create your code in a way that it's easy to update some user commands should the process flow module change - you just need to be aware of that risk and restrict function_s calls to a few user commands.