Yes I can see it can turn into a more complex problem, something I best avoid at this stage. Though the current ZenCart system seems very limited in respect of multiple shipping dispatch locations, all I need is the dispatch post code to roughly calculate the shipping cost.
Any unfavourable inaccuracies can be covered by sufficient product pricing margin and or conservative approximations on packing weight and dimensions. A shipping dispatch postcode in the product table suits me fine. The shipping cost estimation module then just refers to that dispatch post code for each product being shipped.
The current shipping by weight only limitation can be managed for now, with a more accurate weight and dimension field facilitation hopefully implemented in ZenCart down the track that upgraded / modified modules like Aust Post can plug into.
The packaging type is a separate issue I have not factored in on this occasion, as it's less significant for me at present. My prime focus is the shipping dispatch postcode. I would thus re-visit this along with package dimensions eventually and simply consult with each manufacturer on that issue.
I think much of the complexity can be hidden from the customer, by some programming and limiting display options, at a small sacrifice in optimal customised product shipping pricing, based on weight, dimension and packaging types. Thus yes definitely a few challenges, but quite achievable within my desired parameters.
Anyway one step at a time will get closer to the desired result.


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