Modify Plugin for Wordpress - Image Store

Avg Bid (GBP)
Project Budget (GBP)
£150 - £290

Project Description:
I want to use this system or modify it to work as brief attached.
If you have a similar system i am open to suggestions.

It is to make my online sales of equine pictures at events easy for me to maintain, user friendly for customers and Responsive.
Image Store for Wordpress is very close to what i want, however it needs more features adding to it.
Text file is attached with a very detailed brief included.

Really what i want is an easy to manage gallery system for Wordpress to sell pictures online.
I attend around 60 equine events per year at various locations.
Then upload the pictures to sell online.
A typical event will be :

Event location Name
Event Date
Sub categories for each rider attending the event 0-60 riders sometimes more.

Widget to show categories and sub categories of the gallery.

Skills required:
PHP, Software Architecture, Wordpress
Additional Files: Gallery+Requirements.txt
About the employer:
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