well.. as they say - 'you live and learn' as you go along.
for myself, frankly i was more concerned about outside environment and surrounding taman, so put in effort there. didn't realize the layout was poor. on paper, i really didn't realize the staircase would cause the living room to look so tight :( basically i compared to some BI house and the builtup for mercury was larger (1969 sq ft). Hence, never expected this issue.
for the few other concerns, it was not stated in the SPA. for eg: the railing height at the balcony, the height wasn't specified. Also on the first floor, the extra step in the common area wasn't specified. also most of us assumed the bay area behind room 4 was for the washing machine. Evidently (as i'm led to believe from others' feedback) that's not the case.