Hello
Your project description is somehow confuse, as there are several things you're talking about there and which don't link to one another. Should be a full website, both frontend and backend ? Is it some sort of shopping cart or just backend ordering system ? You're talking about some stores, does that mean the website should be somehow multi-store set up ? What kinds of parts is it about, car parts ? And what filters do you need for them ? Do you also need some invoicing system with PDF download of orders or invoices?
Please notice this is a placeholder bid, I'm willing to adjust as long as all the details are discussed.
Regards,
Dragos