With mannekin centre-stage, mark around the feet. We'll be including a circular hole, as I don't want to take bespoke tailoring so far as shoe-size. Nonetheless it allows as economical a cut-out as possible, so as to preserve the structural integrity.
There's a twist crept in somewhere, mainly because at at this rapid prototyping stage I'm working to a millimetre. Airbus do have rulers that measure microns, but we don't.
