Pleased that a beta of this has (finally) been released for public consumption. I’ve worked with the Ontario Geologic Survey to build a bokeh application for viewing their 3D geologic models. Users can click on plan view to draw geologic cross sections, along with viewing actual borehole data projected to section. Layer top elevations/thicknesses can be selected for plan view, downhole data can be filtered etc, it’s essentially a formalized product/output leveraging most of the bokeh-based cross section tool “framework” efforts I’ve put in over the years. More features exist beyond what’s in here, but this represents a great example of what it can do, and (most importantly) it is available publicly. Check it out 
Thanks for sharing @gmerritt123 that is a really terrific app!