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quick question.... or two
You mention you are using MGN15 rails but link to MGN12 rails..
You say the rails must be 328-329mm and the rails you link to are 350mm.. did you cut the extra length off with a hack saw? I suspect so, I suspect it would be impossible to get the rails at the exact length you need.
with suspended rails, so you get any flex in the bed if you push on it... like you do with the 8mm rods?
Did you consider backing up the rails with a piece of extrusion?
thanks for all the hard work on this by the way.. this is most likely the way I will proceed with my Bear.