Very nice build!
I'm looking forward to the updates with a lot of anticipation!
For some while I've been pondering with an ADT build myself, but it likely won't happen for real for a few years more.
Anyways, I was playing with the idea of using gas springs for the bed lift (very cheap) and then a powerful gear motor to pull it back down again with a wire rope. I was thinking something like 2x15kg gas springs 150mm stroke:
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https://www.aliexpress.com/item/free...296134474.html
and this gear motor:
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https://www.ebay.com/itm/231911256302
And then some wire rope around 1mm thickness:
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https://www.ebay.com/itm/222599707119
There is very little extra room to go on for the cylinder with the very long stroke they have to have to get a proper angle on the bed when tipping. I don't think an inline electric motor (like in the electric actuators) will enable you to get a cylinder that mounts in the normal positions or will provide the normal tipping angle for the bed.
Best regards,
Stein :-)