The storefront does handle australian currency and we are integrated with an australian merchant called Eway who process AUD dollars specifically. In terms of the design, you can alter it as you need, for example, we purposefully left out the $ dollar signs so people can simply add a textbox in front of the text fields to fit whatever currency they go with. Euros, Dollars, AUD, or as you mentioned, in the admin panel, you can adjust the weight to whatever you like as well.
The site does use a company called Auctioninc.com for it's shipping needs, but I believe they may be primarily US based, so in Australia, you have the option to use price triggers for your shipping. The weight would not be used necessarily for shipping calculations, although it will show on the order form, which might be useful for your shipping department.
let me know if you have any other questions, or email
sales@levelfourstorefront.com as well.
thanks