1. Import current products from zencart to magento (using mysql) ..
a. including images
b. size attributes with stock and
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2. Design a way stock levels can be updated on Magento (Mysql Select only access on the zencart)
3. Come up with a way that when new products get added to Zencart they will be copied to Magento as well.
We get limited access to the mysql database of Zencart,
We get Zencart for READ only mysql access to get products/stock information.
Products have size attributes that need to be synced since inventory for each size is different.
In your bid please mention how you would approach this. One way were thinking is to use Magento API and push new products or inventory changes to Magento... every 15 minutes or so would be sufficient.