Welcome Dean;
… I have spent a lot of time just on filing perfect squares or flats, in brass and steel or honing straight edges haha…
Reminds me of the first 6 months of my apprenticeship, many many moons ago, cut & file a cube out of a 2" piece of round, using hacksaw, chisel, various files, engineers squares, marking blue, had to make sure that all angles were 90*, sides flat & square to ea. other. All good practice, pig sick of filing after that exercise.
George.