This is an excellent thread! Actually a good tutorial.
If you find yourself rushing to complete a project, especially one that is detailed, has involved a lot of work & includes expensive materials, STOP! Take a breath then take your time. Otherwise, you'll only increase the chances of mistakes or failure. Not a good feeling when/if this happens.
When installing splines to reinforce miter joints, make the fit too tight can be detrimental. Allow adequate clearance for a glue film on each side and be sure the spline is seated all the way to the bottom of the kerf during/after gluing. There is a tendency for the spline to resist seating all the way & spring back out. This can be helped by not gluing the internal edge of the spline and/or mating surface. Clamping the splines in place with a large rubber band is helpful.
Use a palm router for mortising hinges.
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