I think you would need to be here to do that? To many questions, details to do by mail or internet to get what you want. We met for hours with our student 5 times before the final. Ya know, this idea and that one, (his or ours).

Our grad student got all the Engineers to sign off for each faze of the project. Which you would need for your subdivision.
In 2005, it cost us P3,500 for 6 pages of blue prints with a material list and the Engineers to sign off.
Cost today...........UNKNOWN?
B-Ray