The base plinth of the box has now been shaped and lined with felt. My preferred lining material is usually Suedex, which is much less vulnerable to adhesive bleed than felt. In this case, I've elected to use felt because it is much better for stretching and shaping around corners and into recesses. In this case an added complication has been the need for the bottom of the recess to be raked (with a different depth in each corner). This will allow the top surface of the text block to appear level rather than tilted. Next step will be to check the fit of the block and start writing an account of the project.