Hi twinklecloud! Sorry for not replying for so long! Actually like I said, we are not even at the stage of looking for ID yet (actually starting now!) because we probably will only get our keys in March (previous owners want 2 month extension and our first hdb appt is on 11 Dec). For the pergola/trellis idea, we actually saw some other unit near ours which had something similar. I drew it out on Google sketchup, but we haven't checked around to see whether it's possible yet. I've actually dropped a note to ask someone about it on a preliminary level, and they quoted us around $3600 for it plus installation (they just do carpentry) and we haven't asked anyone else about it so don't know whether it's a good price or not. Hope that helps?