Memmeddu
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A belt sander would probably be my choiceno matter where you start on building a machine its all built via straight material
that means a shaper or a milling machine put a welder near anyof the build and it will distort
you stated you have good access to metal steel beams is my reference is a good place to start
a planer can be made inside of a wide steel beam but will suffer slight vibration however we can use the reference of belt sanders to straighten the material