How to implement shipping based on attributes?

I'm doing a site for a photography place that sells prints. They have products in categories that have different attributes set up for them, pricing is based on attributes because there are options for framed and matted prints. There are also different prices for prints on canvas, etc. That much I have set up ok.

The problem is I need to set up different types of shipping costs (flat rate, kinda) depending on the option they chose. I have 3 different types of shipping options:

$25 for on, $7 for each additional

$25 for up to two

$15 for up to three

If someone wants more than two or three for the last two options they have to call her for the actual shipping cost.

Is this possible? I'm very new to Zen Cart but am picking it up pretty well I think. This is my first stumbling block. I'd really appreciate if someone could help me out here.

Thanks!