X-Posed

A different variation on a flat cross.
The person is prone on her back, with arms and legs stretched along the inside of the extended arms, and restrained by wrapping a rope or chain around them, starting at the inner ring and securing it at the outer ring. Since all restraints are on the outside, you get good access to genitals and head.
The construction is stable, so it's a good candidate for a tipping mechanism, instead of legs.
Can be taken apart to five parts with eight wing nuts.

Files

OpenSCAD file: x-posed.scad

Photos

Animations