Please kindly furnish me with the best dimensional measurement of the attached AND YOU MAY BE CONSIDERED FOR THE JOB

3 bedrooms on a plot of 120 by 60 Land
What is the best measurement in dimension for the above as follows:
Sitting room
Dinning
Kitchen
Passage
General toilet / bath
Bedrooms
Master bedrooms and the toilet
ALSO PLEASE WHAT SHOULD THE DIMENTION OF THE WHOLE BUILDING BE AMIDST THE SIZE OF THE LAND.
WHAT IS THE COST FROM FOUNDATION TO ROOFING? With cost of materials

NOTE A thorough job could attract patronage

I'm not interested in your patronage but a good size for a living room is 13x15,dining 9x14,bedrooms 10x12 or 12x12, general toilet atleast 4 wide, kitchen atleast 8x8. to be honest, you need an architect to draft out a coherent plan for you while tweaking the sizes as necessary. you also need to know that sizes and layout depends on the lifestyle of the intended occupants.