Quote Originally Posted by mikestaps View Post
... We ship from USA to locations worldwide (all shipping outside of the US uses USPS). ...
Hmm, has been awhile since I looked at the version available here. If I remember correctly, their is a core limitation for the shipping origin to be located in the USA - so you may be just fine. As for Zen Cart 1.5.4... The new admin pages would be missing the new admin logging mechanisms. And the alterations to core files would need to be done by hand (cannot just overwrite).

Quote Originally Posted by mikestaps View Post
... I know that the API's for both USPS and UPS have the functions for dimensional support, it's just a matter of implementing it (easier said than done!).
So very true. For simplicity sake, that module offers only two modes for packaging... one per box dimensions or x number per box dimensions... Can be configured on a per product (and shipping carrier) basis.

Alas, so far only a UPS module is included (I developed a freight module for DropShip Core, but the was required to sign an NDA and not distribute). The UPS module included in the version available from this website will probably need a little modification to handle international shipping (such as costs to clear customs).