I need a Windows-based desktop app that does exactly what Blocklayer’s online Hip & Valley Sheet Cut tool does, but locally on my laptop. In practice that means: • I can either load a roof plan (PDF, DXF, PNG or JPG) or key the slope, spans and overhangs in by hand. • The program interprets those inputs, lays full-length metal panels across the roof, and shows the cut list for hips, valleys and ridges. • It instantly produces a clean material list—panel count, individual panel lengths, trim pieces and any off-cuts—ready for ordering or quoting. • On screen I see the roof plan overlaid with panel numbers and dimensions so I can double-check before I go to site, and I can print or save that layout as a PDF. Accuracy matters more than fancy graphics; I just want fast data entry, clear diagrams, and reliable outputs. If you’ve built CAD-style calculators in C#, .NET, Python (PySide/PyQt) or another Windows-friendly stack, tell me how you’ll tackle the geometry and what libraries you’d lean on. I’ll test the first build against a handful of real jobs to make sure the measurements match what I cut in the field, so plan for at least one revision round before we call it done.