Couple of things.
Your price sounds off...
Have you checked your DXF sizing? DXF files are unitless, they are essentially just a set of lines that the software follows. make sure before you export them they're in mm as that's what fractory use.
The bit which has the arrow pointing to it is where all the flex is going to come from. The extrusion is by design quite stiff (high second moment of area). this means you'll get the best results using that stiffness to your advantage. A plate has quite a low second moment of area which means it'll be flexy.
If you can mount the upright beam across the full width of the steel plate it'll support the plate and stop it flexing and you'll get a stiffer jig.
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