Workflow for creating Chamfers

[Geo]

There’s no need to model the panels with thickness to merely find the lengths and miter angles necessary to fabricate the parts.

Simply model the exterior Faces only.
This (free) plugin will yield the miter angles with one click on an Edge of adjacent Faces.

Angle Between Planes v1.0 — SketchUp plugin by Clark Bremner

SketchUp Plugins | PluginStore | SketchUcation

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Can i manage ACP(Composite panels) drawings using Sketchup?

One could model the panels in 3D, keeping it simple. That is, single faces, no thickness and single lines where tab notches occur. Then, using one of several unfold plugins available, unfold the 3D geometry to obtain a flat profile. Keep in mind SU faces have no thickness. And so the resulting profile has no allowances for material loss in bending. Once the 3D geometry is a flat profile, one can primarily use Guides and the Offset tool to create the necessary relief notches. Flattery …