Thanks for your inquiry on agile multiple seller/vendor modules.
In my case I will be selling paintings.
So width and height will change, depending on the client requirement.
So for the same painting, I might have 5 or 6 different sizes. Nevertheless the shipping price will not change.
Can I define - while creating my products - different size & price. And ultimately, can I define a kind of "default pricing" so my sellers won't have to create the same matrix each time they add a new painting ( pricing will most probably be the same)
PrestaShop provide product attribute combination function, like CPU, RAM, DISK for computers.
The same way you can define attribute "width", "height" and define different price for each combination of width and height.