If you put in the time to push through the LO quirks, you could replicate the elevation CAD blocks with any of your SU model’s added detail reflected - and if you change the model, the elevations update. This scale of piping detail seems doable for a SU to LO workflow.
For your current workflow, are you exporting SU jpeg views and putting them back in CAD to add the leaders/text/revision clouds?
If you go to YouTube and do a search for “Lake Oswego LOIS Webisode”, you will find a sequential presentation of the project.
Also, an overview here: LOIS Overview - YouTube
It is not my intensional to hijack this thread. If there are more questions, a new topic can be started.
@ MillerLuke
Just a few examples of water treatment related work from Google Photo albums, a mixture of SU and other misc illustrations. Some are more symbolic rather than detailed precision models for presentation or proposal work.
The above link includes some early isometric work done for O&M manuals 2D before SU was available.
3D warehouse, “jsc_associates”.
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No construction drawings were done in SU; all done in AutoCad. However, some of “final” SU models (not shown here) were ported to AutoCad and then repurposed for construction drawings. The realistic renderings were done by Pete Stoppel who partnered with me on different projects.
I use layout for very basic presentations but usually i do all my CDs in AC. I export the Jpegs and import into AC and like you say add the texts etc. Im much faster with AC.
Wow you got some nice work in there, alot of the assemblies look all too familiar with some of the work i get involved with in my job. Thank you for sharing 
Great work MillerLuke. This is what I am hoping to make use of myself. For conceptual layouts that can be created quickly. I am a Piping Engineer based in Abu Dhabi working on upstream Oil and Gas project definitions. What it takes a lot of scope descriptive can be better conveyed through this.
SketchUp is very underrated. I love how flexible it is, also i find not having to use dropdown lista and having to actually design the equipment/ material helps actually be a better designer and understand builability. You almost doing the job on the screen if that make sense. Once you design standard things for example pipe and valves make sure you save them as components into your files so next time you have an arsenel of items you can paste in like you would blocks in AutoCad which will save time.
Here are additional examples of how I use SketchUp. I’ve been integrating topographical surveys into the model, which has been invaluable for modeling and identifying underground pipework. Using this approach, I was able to design a chamber and pipework to intercept an asbestos pipe. Additionally, I’ve started incorporating 3D scans captured with my iPhone into my designs whenever possible, enhancing communication with the project team and the client.
