Modern Granny Flat Conversion for Airbnb

I'm looking to convert and extend a granny flat with the primary purpose of generating short-term rental income, such as on Airbnb. The interior of the property should be designed in a modern style. Requirements:... (Budget: $30 - $250 AUD, Jobs: AutoCAD, Building Architecture, Building Design, Building Regulations, Construction Management, Home Design, Interior Design, Project Management)