Well I ordered the rear cargo piece to get started, this will allow me to mount my fridge and slide and see first hand the durability and build quality of the product before I commit to the other $900 for the seat areas. I'll report back my thoughts when I receive it, which will likely be weeks from now since they build to order. Thanks for all of the input guys!
You will find the holes and rivnuts are designed for their modular drawer system. I have a Dometic slide and my slide is mounted on a combo of 2 of their rivnuts and 2 of my own drilled holes with rivnuts. I tapped out two rivnuts that I didn't intend to use and reused on my own drilled holes. The durability is certainly there but just some insight on what the holes are for and some possible workarounds.