ToDo

Should have

Material usage overview
Generate cutting list
Support for fractional inches (see, not all europeans look down on freedom units!)

Render width and height of the boards in the previews (simplified version implemented, moved to Nice to have)
More advanced options, like custom direction per strip and mixing multiple edge grain boards with different layers for the end grain board (the code is half prepared for this by having the boards array encapsulating the layers, though it's all hardcoded to board[0] now)
3D effect for previews emulating thickness / crosscut width
Make it a tiny bit prettier overall