Pre-Dev Questions for an eCommerce Site

We are planning the development of a new e-commerce site. We want to try Framework but have a few questions:

Is it developer friendly? We are using a completely custom design and may need to change column and layout elements and do some heavy styling.

Can we create customized groups of categories and sub-categories for display in any of the widget areas?

How well can FrameMarket scale? This client could potentially have thousands of products. Are there import/export option to bulk update the product line?