Greetings,
I have read your project description and are you saying that you have an existing cart website, so we need to resolve those issues? May I ask URL of your existing website?
Apparently, it looks like around 70 Man-Hours work but please drop me a message thru' PMB, so we can start further discussion, as we are very much interested to do this project for you.
Look forward to hearing from you.
Regards,
YK
LEADconcept