Online Shop Application eg T-Shirt designer Printenator

Hello,
i got an iquiry from a client who want his own online shop with a Product designer application.

I know he could buy certain shop software or a licence.

But is there a coder out there who has intrest and the power todo this for my client AND the community.
i think i would make it free avaiable to drupal.

example of a design shop application
http://www.shirtcity.com/shop/index.php?club_start=de_idcom
http://www.printenator.com/

Ideas, Thoughts?

You can contact me here on drupal or on my website
galaxymachine.de

Cheers,
Laura