I think I have a picture now of how applying the BCS theory describes the superconductivity of YBCO.

 http://230nsc1.phy-astr.gsu.edu/hbase/solids/coop.html

Considering the concept of Cooper Pairs described in the former link,  the YBCO superconductor as shown in the next link is made up of two solid planes (chiefly composed of Copper Oxide,) that support the lattice of (positively charged) Yttrium ions that supports Cooper Pair formation.

http://230nsc1.phy-astr.gsu.edu/hbase/solids/hitc.html#c3

(That is of course presuming that Cooper Pairs are responsible for superconduction rather that some nucleon effect.)

If this is true then this model describes:
1) The two elements to a high temperature super conductor are,
    a) A structure to support a positive ion lattice,
    b) The positive ion lattice. 
2) The temperature of the Tc for a superconductor is dictated by,
    a) The stability provided by lattice support structures,
    b) The mass of the ions composing the lattice,
    c) The lattice pattern and separation distance of the lattice ions. 

A superconductor might be fabricated from a  spiral or cylindrical polymer where that spiral or cylinder is used to sheath and support lattice strings of positive ions.  Probably the best shape for the cross-section of the cylinder or spiral would be a star although an ellipse would probably do ok.  Such a fiber structure would probably be more flexible (and less brittle) than the planar structure of the ceramics.

The next link describes fabrication of flexible superconductors based on YBCO and possibly demonstrated the portability of the Yttrium lattice.  When YBCO is put in a silver cylinder and that cylinder is drawn into a thin wire, the superconduction is found to only occur at a plane near the silver sheath.  In answer to this the researcher placed a silver wire core into the cylinder before pouring in the YBCO powder and drawing the wire which formed another plane of superconduction this time near the core silver wire. 
http://230nsc1.phy-astr.gsu.edu/hbase/solids/scex2.html#c5

The ceramic disk fabricated by Podkletnov forced the composite planes of superconduction into a relatively flat plane perpendicular to the disk's axis.  Fabrication of polymer superconductors may not only make such an planar orientation easer to produce but may also yield room temperature superconductors by virtue of more accurately spaced ion lattices.