Hi People

I have been contracted to a company that has been using SW since 2007 and developed a model of their entire plant.

The model has "evolved" project by project and as SW knowledge has grown.  It started with the intent of being a working model of the plant but without any real planning and we are now trying to figure out a "Best Practice" going forward so that we, and those who follow us, can use the existing and add to it.

The company is a large mining company and uses contractors for most of it's drafting requirements.

My question is;  Is there anywhere that we might be able to get some information on how to develop a system to do this?   Build and maintain a model of an entire plant, structural, mechanical, civil and piping.

I don't know if this makes any sense but I'm sure that someone has some experience.