Hello,
I understand that you want to modify KopaRent. It is my pleasure to help you achieve your target.
As per my humble understudying, I will proceed as follows:-
1- Revise the 4 modifications detailed list (as it is not attached).
2- Revise the hosting and Joomla! installation to know the version of PHP and technical specs.
3- Execute the appointed modifications
4- If you want, the entire component can also be recompiled so that you can install it directly on any other Joomla installation.
** WARRANTY **
In case of not 100% satisfaction, you will be refunded all paid milestones.
Your cooperation is to provide me with the needed information on-time is very important to help me complete the project timely and with the expected quality.
Shall you need further assistance or inquiry, please do not hesitate to contact me.
Kind regards.