FREE housing for Bombay's slum-dwellers was Shiv Sena chief Bal Thackeray's electoral plank in 1995 when the BJP-Sena combine stormed to power in Maharashtra. All of 40 lakh houses was what the Sena chief had promised. By 1997 this figure was trimmed down to 10 lakh homes, then to two lakh. And now chief minister Manohar Joshi has announced a less ambitious, albeit castle-in-the-air scheme of providing 50,000 houses before he goes back to the people in 2000. Bureaucratic circles already dismiss the scheme as a mission impossible which would require not only a huge financial input but also stretch the civic agencies.