BMW Z1 retracting doors.
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What it looked inside:
https://www.youtube.com/watch?v=oBBKPAj8gdQ
Previously:
https://www.homemadetools.net/forum/...158#post126125
https://www.homemadetools.net/forum/...157#post126105
https://www.homemadetools.net/forum/...003#post100475
https://www.homemadetools.net/forum/...065#post129978