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I didn't start cutting but drew what could be a layout. I could go steeper but that makes the gap to the motor very small. I drew a fainter pencil line to show that angle. The darker sharpy lines show a possible new design. The length of base is near enough 500mm the height goes down to 220mm. I also looked at reducing the width, from 600mm to 400mm. This would reduce the materials needed for the outer body by around 40% I think. I'll need a spreadsheet to really work it out.