menu + products only viewable by login

Hello,

I am currently building a customer login shop.
The goal of this shop is that customers can search for their own products
with their own layouts (we are a printing and sign company)

Other customers can not visit other customers products and menu layout
Some clients only use sign products where other use our full service.

Is there a option where clients see a blanc paige but when they login they see there own layout, products,
and ideally there own banners. I tried to do this with customergroups, but other clients does see the menulayout.
Non clients may not see any of the menu's and products.

I hope one of you can help me.

regards
Bram