According to 2 newspaper articles in Straits Times and Lianhe
Zaobao some time back last July, construction at stage 3 is the
fastest, and of all interchange stations, construction at Bishan is
going the most smoothly. Some days back, there was a sign along
Marymount Lane saying "Marymount Road will be reinstated from
2/2/07 onwards". Now, the two station entrances are half done and
the station concourse dug in the middle of the road is being
covered up. If I can get pics, I will try to upload.