I don't want to bother you with standard offers so I will be straight to the point.
I've developed e-commerces on Prestashop, Magento and Woocommerce for more than 6 years now and also created custom theAltro
We have accomplished 90% of the project which is similar of your requirement. All we need 10% customization as per your requirement set and specifications. I want to discuss in personal chat in order to explore your neAltro