for instance looking at Lulu, it's not clear how well their product catalog/cart/purchase pieces are integrated or how they are integrated. if we use bitweaver to host our shopping site, will we need to do this integration from scratch? the bitcommerce project does not seem to be very active, so unless i'm missing something that won't help much (maybe as a starting point). any guidance on this?

Bitcommerce is said to be usable by "advanced users".