Hello sir, We can do that for u. We ll develop the ecommerce in "Opencart" platform which is opensource and much better than weebly. In weebly, you are limited by certain aspects, but in opencart, you are not.
One thing we did not get u. What do u mean exactly by "good checkout with expandable sections"??
Can we have a chat to proceed further??
Waiting for ur reply to get started.
Regards
Prayas Technology