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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Currently I'm thinking of trying CSG (https://github.com/manthrax/THREE-CSGMesh) . - It's hard to tell, but from the demo's (like this one: https://manthrax.github.io/THREE-CSGMesh/demos/CSGShinyDemo.html) I don't see the lines where the objects intersect, presumably because the shadow works on them as one object. However can see the same kind of lines I'm having where the cubes intersect the floor. These type of lines are especially noticeable when the shadow is strong. Still, CSG seems like a bit of effort, (and possibly a performance cost) so I'm still hoping there is a more straight forward solution... Thanks again.