Edit2 - Fixed lower holes which I had forgotten to rotate for Dragon mounting.
Edit - I was asked quite a lot to make a hex nut variant so here it is. For the insert version you can find it here. Note I haven't printed it but it's essentially the same as my tested insert version but with the BMO dragonfly hex nut portions.
Keep an eye out on www.3dpandme.com for full installation pictures and content.
This is a modified version of the official dragonfly bmo mount from the EVA3 design. https://main.eva-3d.page/#getting-started
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The author remixed this model.