Dear Sir,
We have experienced OpenCart developer, who can work on your website, so please drop me a message to start further discussion.
Here's answer to your questions:
Maybe, can you suggest another one technology to develop it?
LEADconcept: We can do it in OpenCart, that's not a problem but I will still discuss with my technical team lead and confirm you.
Could you please provide high-level estimate for the project?
LEADconcept: Can you please schedule a quick meeting to discuss further, after that we can give you our precise estimate.
Could you please a approximate budget for the project?
LEADconcept: Can you please schedule a quick meeting to discuss further, after that we can give you our precise estimate.
Look forward to hearing from you.
Regards,
YK
LEADconcept