I don;t know  what resources you have there.

Minimum equipment approach

1 Heat the plastic and pour the rectangular shape oversize, Possibly 
flattening down  and spread it out as
  you do.   (How much it spreads naturally will be dependent on both 
material and surface temperature.
     If you have a big enough machine you want to use it to control the 
pour path.
2 cut off the edges and recycle the material  with mill or saw.
3. mill the top if the flattening does not leave the right height.
4 possibly heat polish (slightly melt the surface) the form if glossy 
surface it more important than sharp rectangular edges.

You may want to reverse steps 2 and 3 and heat  polish the top for a 
glossy surface before cutting the edges.


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