Low cost housing design for my village

Dear all,
I belong to a village in okara and many of the houses in my village are mud houses, few years ago somehow i managed to construct 20 houses with mud bricks (???) and roof with girder + t-iron. The idea was to give respectable living to the poor of my village.
Unfortunately the problem still exist, during the excessive rains couple of times those house collapsed. I feel there should be a permanent solution to this problem.
Can somebody help me in this regard? Can you design a basic two room based house which should be cost effective as i will be doing this out of my own pocket. I want two rooms for each house and initially four houses.
Two houses in front facing west and two on their back facing east so basically back wall be shared.

AA

I apreiciate peoples like you,having pain for poor. I also belong to village but fotunately I am civil engineer and constructing hou ses and Towers.Please contact for detail discussion

Muhammad Akram

03025462306