Enameled copper is glass welded(?) to copper. Or at least it is fused glass tightly adhering to a clean acid etched copper surface; in one sense the glass is acting as its own glue.
I know enameling is done at a temperature high enough that the glass flows under the influence of surface tension but I don't know the minimum temperature. Perhaps the copper bars could be attached by clamping them against the glass and heating the whole lot in an oven with them resting on a flat polished stainless steel surface. Perhaps if the copper was 'tinned' with a layer of glass first by enameling at a high temperature then the glass-to-glass final bond could be done at a lower temperature.
But when everything together how are you going to stop thermal expansion in the copper cracking the glass; think windows in, or rather not in, Hancock Tower.
An open mind is a virtue...so long as all the common sense has not leaked out.