The Laguna Swift gantry tram is off about 3/16” over a four-foot width, i.e. the gantry is out of square by 0.2 degrees. You can verify this by putting a reference square object against the dogs and comparing with the cuts in the spoilboard, or by measuring distances and comparing to a right triangle.
First thing to do is shut off the machine while you’re close to home position. Pull the gantry to the end stops while machine is off and hold while you boot up machine. Once the drives are engaged you can let go.
Cut a test square and recheck
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The most accurate way to verify square is to use a Vbit to cut a shallow Square in the bed and measure the diagonals.
The MDF spoilboard is subject to changes in environment in the shop. The dog holes can loosen up after repeated use. Measuring from the dogs to cuts in the bed isn’t the most accurate way to verify things. Not saying the gantry can’t be out of square, but measuring a fresh cut square is better.
you don’t actually need to waste that much material.
you don’t need a line, just attach a small piece of scrap in two opposing corners.
make a mak on each one. in theory you could even put a sharpie in the collet and jog x0 y0, z down to mark without actually running a job, z up, jog to x1 y1 z down to mark, z up
calc hypotenuse sqrt((x1-x0)^2+(y1-y0)^2) and measure the distance between marks with a tape measure