"within" a tressure (and bordure?) should be valid

And should we ensure that the charge doesn't overlap the ordinary here?

e.g. quarterly first Gules three lions passant gardant in pale Or armed and langued Azure second Or a lion rampant within a double tressure flory-counter-flory Gules third quarter azure a harp or fourth quarter vert a dragon gules impaled with ermine;;; over the quarters a lozenge escutcheon azure three fleur-de-lys or