In the process of building a pair of kneehole desks. Practice calls for dovetailing the carcass bottom to the sides, in order to ensure consistent wood movement. Worked up the math to cut a half blind dovetail router guide plate out of lexan, to accommodate the depth of the desk (17"). Took a half dozen tries to get it right. Put the guide on a make shift dovetail jig, and it took another half dozen attempts at getting the setup correct. Finally able to dovetail both sides of the desk. Joint is nice and tight...