Duplex Builder Sydney ?

Hi All

I have been trying to research on reliable builders (custom) for a duplex development I have planned on a block of land in Sydney. Every renowed builder has got +s and -s reviews and all the custom fairly new builders have got no reviews only. I am finding it difficult to trust one and kick start my project. Would anyone here, has got any personal building experience and recommendations ?

Few of the builders that I am considering are, any other builder you would like to recommend ?

Champion Homes
ZAC homes
Merit homes
Xclusiv Built projects
Chateau Builders
HR Building pvt ltd
Clarenden Homes (Saying they will do custom)
Metricon (again saying they will do custom)