Hello, I represent a team of developers and designers. We can make design and build your website, but there are couple questions:
Wordpress is made to use their dashboard. Regular will have to use dashboard and it will not look good. I assume you want regular users to have their own profile pages, so we will need to think about another CMS. Individual page for regular can be developed on wordpress, but a lot of things will have to be redeveloped.
Another question is about current website. Looks like it has CMS, maybe we can improve it?
Third question is about forum. Do you want usernames and passwords to be same on both website and forum?
Designs will not be a problem, just show what you have (rebranded) and tell your expectations.
Here are some examples. However in team we did not build such large portals, but one of my developers worked on [login to view URL] . Design is not good, but it is supposed to be a large marketplace for used vehicles.
We are a webstudio, so we have a lot of design projects (we offer landing pages to our customers), please check some latest designs (made during this month):
[login to view URL]
[login to view URL]
[login to view URL]
Also there are projects with CMS (completed and on developing stage):
[login to view URL] -on development stage, it is drupal website.
[login to view URL] - it was finished but on our test server is not the lates version. We worked only with backend.