It's a bit impossible to judge how much a plant will stretch in flower - but if she starts to get too big, you can always LST or HST her to keep her down... I wouldn't have any worries!
And btw, I, too am a farong although, having lived in Korat (Kolat!) for about a year, pronouce it "falong" - :-D I lived there a LONG time ago but can still remember some of the language... nung, song, sarm, see, ha, hok, ched, ped, kao, seep... and, of course, "bai sha noi na kah!"
Good luck ... Thanks for taking me down memory lane to my time in your lovely country!