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.
Craig
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