Hello there,
I have reviewed your reference link and understand the requirements in details. Go thoughts on the following points:
1) Do you required similar color schemes or you have other preference?
2) Do you have logo or want to design it from scratch?
3) User can ask questions on this forum like ref site, also can able to like/unlike on the answers ?
4) Only registered members can able to reply or any visitors can rely the answers?
We have worked on many Custom PHP, WordPress, Codeigniter, Magento and other applications. So, we are confident to deliver you quality services at affordable price under the deadline.
Let me know your thoughts on the above quires also it will help us to share our portfolios.
Warm regards,
Dip