Product Showcase - Interior

Right, well left actually ;) This is the left side, you might figure huh isn't that the rear? Nope, the new Cosmos has shield plating (metal) that you use to hide the HDDs and in the lower segment, the PSU. Your PSU is separated in that lower compartment. Air will be drawn in from the front based in fan intakes. Graphics cards could even be 32 CM in length. With the drive cage installed. Inside the Cosmos C700P, you can rotate that removable motherboard tray to create a chimney effect; ergo you can place your graphics card in a vertical position if you'd like that. Mind you that the mobo tray also can be positioned on the opposite side to create an inverse layout. There's plenty of flexibility alright.

So on this photo I removed that right side covering panel, this now opens up the driver cages. Here Cooler Master has been on budget control, as they only include two HDD trays. Optionally you can purchas more however at a price of €5.99 with a similar price in USD.
 

 
HDDs are easily seated and sit in rubberised mounts, again two is just too little for a 299 EURO chassis IMHO. I am however sure that you will be able to purchase some extra separately. Not something insignificant, do you see that mechano style holes everywhere, again this chassis is modular and can be reversed. Again, all there as you can take out the trays for motherboard, drivers and shielding and place them on the other side of the chassis if you wanted to do so. 

At the inside top you can see plenty of clearance / space for cooling, you could house a triple-rad there for liquid cooling. Hey, space is the final frontier, right?