Ecommerce Solution For MarketPress?

Hi, I am really struggling with something and maybe you have some
advice or suggestions.

I need an ecommerce solution for this kind of shop...

There will be a number of products (say 15-20). A customer will purchase a box of products e.g. 5, 10, 15 products. Each box has a set price. The customer selects which products can go into the box from a list (preferably a gallery with an image and when the image is rolled over, text information is displayed). When the right number of products is selected for the box, the customer will check out or go on to
purchase another box(es).

Idealy, it would work a little like these links:

http://www.thelittlechocolateshop.co.uk/picknmix.aspx?iProd_Cat=pickmix
or
http://www.lindt-shop.co.uk/our-ranges/lindt-pick-and-mix-1.html

Is this possible?

Thank you so much.