Create the surrounding ruling surfaces for a four corner surface about silk HOT 1 CLOSED

Comments already in post linked above. Final notes before closing the github issue:

By my estimation, the above request asks for a setup where the only difference to the 'normal' Silk workflow lies entirely on the FreeCAD side of things. namely, the creation and handling of planes.

If you already have created 4 planes floating in space, using FreeCAD sketches to draw control nodes on those planes will result in Silk curves and surfaces that are tangent to those planes. The normal workflow produces the desired result.

If you create multiple curves/surfaces by drawing more nodes on those planes, and aligning the nodes (using sketch constraints, for example), the resulting surfaces will connect. This is the fundamental task that Silk performs, and has since day one.

As an example, see this post,(https://old.reddit.com/r/FreeCAD/comments/wp2f47/bevel_tool_no_good_try_the_silk_workbench/), where the user has drawn sketches on various existing surfaces to create a surface that is tangent to all reference surfaces (planar AND curved).

Silk is intended to allow users to connect smoothly to existing surfaces (planar, cylindrical, spherical, and all Silk surfaces themselves), by the use of sketches. At this time I have no desire to create or process plane objects, beyond the fact that there is already a way to do so by using sketches placed on those planes, which is the main workflow.

from silk.