My collection of 74LVC8T245PWR chips have arrived.  These are 24-pin TSSOP chips which I had to build my own break-out boards for.  That was frustrating (especially as I'd never soldered SMT parts before); but, I was nonetheless successful.  Continuity checks indicates no bridges, shorts, or open circuits, so these ought to work out nicely.

I've already updated the circuit schematics to include these new chips in the design.  I lost steam after rendering the schematics, but hoping to wire them into the circuit this-coming weekend.