If you want to use a high quality turntable in your O-scale track plan, take look at the products of Millhouse River Studio and download the SCARM library file from this post. [>>>] Millhouse River Studio O-gauge Turntables in SCARM (Updated)
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If you want to use a high quality turntable in your O-scale track plan, take look at the products of Millhouse River Studio and download the SCARM library file from this post. [>>>] 
Read this post to see how the track supports can be easily placed under long flex tracks at position by your choice. 
This tutorial will show you how to work with the basic road section in SCARM in order to create detailed layouts with impressive scenes. 
Read this article to see what is new, improved and/or updated in the new SCARM version, released today. 
See one interesting O-gauge layout, designed in SCARM and build in a basement with Lionel track material. 
Read this post if you wonder how to make a flipped / mirrored schematic image of a given SCARM track plan.