I'm currently using OSC for my store and have hacked up a USPS and UPS shipping module to allow me to accomplish the following for USPS dimensional weight shipping quotes. I never did get time to post my code for the OSC community.
Each item in the catelog get its own dimensions (item only) and weight.
Using the dimension of the item I can then estimate the size of the box needed to hold multi item orders and get an accurate quote.
I have a screen in OSC where I can define my boxes on hand, their dimensions, and their max weight. I also define what order the 'fit routine' tries to pick a box. So it tries the small box first and if the total item dimensions are too big it goes to the next sized box. If the order can't fit in one box it splits the order into 2 boxes and quotes correctly for multi boxes.
My question is, does this type of module exist for USPS shipping quotes in Ubercart?
My plan is to port my OSC store to Ubercart in the near future. The above shipping quote feature is something I must have before I can go live with the Ubercart store.
The quote system needs to be accurate (no artifical padding after the quote comes from USPS) for both domestic and international.
Is there a module to add weight attributes to product options (eg blue one weighs 2oz more than the red one)?