Selling Off The Plan

I got unique and very beautiful luxury properties for a very niche market that I want to sell in Australia. I have not found homes like this in the country. But I am not familiar with the Australian property procedures. I am not residing in Australia and therefore wanted to tie in collaboration with an agent in Australia to sell these properties for me – and I would then complete the project:

My problem is mainly to resolve the payment process since funding need to be covered through a pre-sale.

1. I have recently signed with a new manufacturer abroad that will make the luxury homes super eco-friendly. It will also allow me to bring the absolute highest quality homes all the way to Australia. Are there any regulatory restrictions for this?

2. I understand that payments for Off the plan properties are generally only a small deposit of 10%. In my case because I rely on most of the supplies and completion abroad, which is then shipped over since it's not really available in Australia itself – I need 50% of the property sale price up-front to be able to complete the sale and start completing the work (I have to pay the licensing rate to the architect to release the plans, have the pre-engineering prepared, manufactured and paid, order all custom features, hire local contractors to do the foundation, etc.). The shipping takes a few months so to get everything done asaps and be within competitive time-frame of other developers, half down payment is necessary with remaining balance due on the handing of keys. Is this possible or will this high upfront cost deter or confuse buyers?

3. I am not familiar with the sale/purchasing process in Australia. Would it be normal and acceptable to ask the agent to handle all buyer communication, contracts, procedures and paperwork – and for me to liason only with the agent rather than the client direct?

4. Are payments for pre-sale issued to the builder, or is it normal to demand Escrow Accounts? 

5. I will complete the project with a combo of overseas engineers and builders specializing in these homes, with a local developer managing all preparatory work, and project manage the development according to local regulations. Is there regulations that would delay or hinder the use of a foreign core team?