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Jordan Sipsip left a comment which among other things asked if I had noticed any sagging of the rails.  I really had not noticed any issues with the rails flexing under the weight of the gantry, but I decided to do a quick test.  I stacked a number of pieces of wood under the center of the longest rail so that they were almost/barely touching the rail.

Flex Test Starting Position

I then moved the gantry to the edge of the stack and attempted to remove the top most piece of wood…  it slid out without any binding at all.  While not very scientific, I think this demonstrates the minimal flexing issues I have observed up to this point, and bodes well for the future.

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