This makes a great DIY project for a Toolmonger, but cutting the angles can be a problem. After reading this post on the All-In-One Clamp, and this post on the MilesCraft Saw Guide, I still had no solution for how to cut long, straight lines that’re at odd angles to the edge of a board. A table saw with the guide set at an angle will do the trick, but here’s a way to manage it if your shop hasn’t grown that big yet.
With a ruler like this six foot monster or a piece of square tube, a couple of clamps, a tape measure, and a circular saw, you can make long, straight cuts at odd angles. Just mark out the angles you want to cut — using the end points and a chalk line is an easy way to do it. Then mark a series of secondary, parallel lines that’re as far away from your cut lines as the distance of the saw’s blade from the edge of the saw body. Now clamp your ruler or square tube on the secondary line, and cut away. This makeshift fence isn’t pretty, but it’ll work in a pinch.
This can save you some time on a project that’s not all right angles. Luckily, a piece of square tube can even span a sheet of plywood along the diagonal.