IMO the rqt was originally strung using tubing at the top, and on the throat area; and so I'd always string it that way.
Would it hurt the frame it tubing wasn't used? probably not unless those holes are damaged.
Head IG Prestige MP; USRSA MRT, Wimbledon stringing team since '04; Babolat stringing team '10-'14. Twitter - @therqtstringer