installs are very neat.
The watercooling cases are all done by two technicians with high levels of expertise. These are the guys who have watercooled many computers and own watercooling systems themselves.
I personally oversee all watercooling cases built in our technical department to ensure that they are high quality.
the 650d case you linked to is a good choice, it presents excellent value for money and is good for installing WC gear inside.
whilst we dont have any pictures of a 650d watercooled case without the hardware instaled, here is a quick picture of how they look overall.
[please note that this is the older revision, we now use an ek 90' rotary fitting to make the tubing routing even neater]
this is the cheaper bitfenix case, ready to ship out
it is essentially the same as you would get it but without any hardware in.
as bedazzled states, it really is as easy as installing a block. if you can install a cpu cooler, then mounting a waterblock is even easier.