Hi harry,
I just had a look to your website and have a pretty clear idea of what you need. It looks like the intro video is not quite well integrated with the rest of the website. It shouldn' t be too complicated to make the transition smoother and make the whole thing a bit more uniform. As for the mobile menu, there is different options here, the most common being a menu that slide in from top to bottom instead of right to left as it is now. Depending of what you need, I would implement that. Since the website is running on WordPress I would need a bit of time to understand how the template is structured in order to not mess up the code and do things properly so I would say 3 days to do the job should be all good. Please note that I put my fees a bit cheaper than anyone else since I am new on this platform and need to build up some positives reviews ! Thanks !