I need a structural engineer

Job ID: 34112126

Budget: $250 – $750 AUD

We fabricate steel mobile bases for tiny homes that are able to be lifted by 4 lifting points. Need to no how much it would cost to certify? 200pfc perimeter with 150x50x2 duragal rhs. Various base sizes ranging from 12m x 2.4m to 8m x 2.4