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My first parallelogram frame actually did just that, without widening the top. It had a few disadvantages.

1) With a standard Prusa 1 or 2 X axis, build height was not improved, because the belts still run outside the frame, and still interfere at the top of the build height.

2) Having the Z screws be under compression instead of under tension may be a disadvantage when using more flexible (i.e. M5) Z

3) Moving the motors to the bottom requires the use of longer Z screws, which reduces the number of Prusa frame parts that can be reused.