Joists, joists and more joists.   I started by cutting and fitting the joists for the corner board under the electrical distribution box, where the Paddington and Penzance loops overlap. First I cut a joist to run along the diagonal edge of the void at the back, then one for each end of the board. I left these over-long so that they can be trimmed back flush with the baseboard tops when the front fence is fitted.   I screwed each joist to the L-girders from below, so tha
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