Need a site similar to Gumroad Concept Digital Commerce

Hi I require a site similar to Gumroad have a look at this site and revert main components needed now are Make seller page ( multiple users can setup seller pages), Revenue share and design, custom URL of course mobile ready.

I would like to do functionality of site first then the design ( less important)
So the seller page , revenue share , custom URL's , allow multiple sellers to setup accounts and setup seller pages
and allow sellers to add overlay of their page on their own page.
see
https://gumroad.com/guide
https://gumroad.com/guide/basics/reach-your-audience
https://gumroad.com/overlay

Would suggest you setup a seller page and test how the revenue share works also setup as multiple sellers.