Hi,
Hope you are doing well,
Have Checked with the invision link you provided with the details and checked with all the screens.
The provided Screens and functionality it seems we add payment integration and User login to post their own Article.
Please find the Estimation for that.
it may need 100 Working Hours Approximately.
The Whole Project May take upto 2 Months to complete.
Ping Me for More Details.
About MySelf:
My self as a web developer having 10+ years of experience In development and web services, Specialization with CMS like WordPress, Megento, Joomla,Neto, Shopify, BigCommerce and Frameworks like CI,Zend,cakePHP and laravel also i'm good with UI/UX using HTML,CSS and jQuery.I can handle this work and will support when ever you needed.
I have been doing WP them, Plugins development from Scratch, adding hook and filters to WooCommerce on custom them and functions.
I'm assure you the quality work and delivery will be done with in estimated price and time. Ping me for more details to proceed.
Thanks & Regards,