Hello, I can build fully responsive and user friendly ecommerce website in Open Cart using Journal 3 theme and Purpletree multivendor extensions as per your requirements. I've loads of working experience with ecommerce websites and I am absolutely sure that I can do the project very well.
Lets have a quick chat to discuss further.
I have extensive experience in designing and development of Websites, Mobile Applications, Management Systems and E-commerce or Online Stores Solutions.
Kindly have a look at my Portfolio and Client's reviews via this link,
https://www.freelancer.com/u/junkyfunky
Thanks,
Faizan A.