Lower body:
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First off, got a humble belt to hold the leg pieces up
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The groin piece goes over the belt and basically just hangs onto another elastic belt. Some button snaps with elastic are also attached to the sides and they connect to the posterior plate
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Locations of where the button snaps attach in the posterior plate, this setup will likely change when I finish the whole space diaper though lol
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Top of the thighs connect to the previously mentioned belt
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With two buckles that connect to the knee piece, supporting it and keeping it straight
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Finally, the inside of the knee
Hope this helps you out! And if you're unsure about anything else feel free to let me know