On the interior, there’s a lot of space, but that’s not surprising given that the 750W power output doesn’t require as much hardware as you would find in something like a 1000W+ Platinum rated unit.
So the PSU in my PC is cheap, old, not modular at all, and the fan's starting to grumble. There are lots of much prettier replacements on offer. I have a fancy for one of them there fully modular PSUs ...