Hi,
1 - Like I wrote in my previous message :
Regarding the fact that the patch is composed of several modifications in different files ; it will be complicated for me to give you all instructions in the forum ; it might not be easy to follow (specially for some small patchs).
The modification is composed of a lot of small modifications and that's not easy to provide instructions for them.
2 - The order listing have data from the hikashop user table but it does not link with the Joomla user table.
So if you want to display elements from the Joomla user table in the listing, it will require a view override ; the usage of a custom plugin to use the trigger "onBeforeOrderListing" and affect the SQL query could be a good way of implementation.
Regards,