ecwid store

Hi I am interested in creating an online store easy web in ECWID , Amazon, EBay and Shopify as well as app. I have gone through all video tutorials and studied all options from ECWID and as for product I will only have two for US market and 2 for EU market so customization will be extremely easy all as well as API integrations I am interested in. Further customizations I need are: - stock updating with Shopify ( with Amazon and eBay no problem). - Group purchases. If item A costs X with inmediate delivery I will have possibility of 20 customers getting together and buying it for a 33% less. I want two options for this: A) client finds within his own contacts family or friends and all form the purchasing group B) by country and if many groups zip code C) both of above - App I also want to include a functionality for mobile phones when together very easy inscription in the group just by putting one phone next to other...via QR? Bluetooth? Point of sale using ECWID integrations but without additional mobile hardware? - and I would like to customize CCS or Wordpress with some 3-D and animations. Can you do all? If so mobile app group connection how? Best quotation?