You cant always re-invent the wheel, but with the right manufacturing processes, you can make one a little bit more round.
BSH takes their catch cans seriously. Externally all cans are welded together to avoid the all too common leaking issues bolt together setups have. Internally better than the competition by incorporating mesh baffling to slow down oil vapors so they cool and condense inside the can instead of your charge piping/engine. All connections are made with push lock fittings and hose to limit the use of hose clamps that would otherwise clutter up the bay. Integrated drain fittings into the base of the catch can makes maintenance a breeze.
All of the BSH catch can systems are designed to be completely reversible and mate up with all factory pcv connections utilizing vehicle specific billet connectors. The R53 catch can kit ships complete with a laser cut stainless steel bracket that will for direct mounting to an easy to access bolt in the engine compartment.
For 2007-2010 R56 MINI Cooper and Cooper S Hatchback, 2008-2010 R55 MINI Cooper and Cooper S CLUBMAN, and 2009-2010 R57 MINI Cooper and Cooper S Convertbibles, see G2NME4601
For 2011+ R56 Cooper S Hatchback, 2011+ R55 Cooper S CLUBMAN, 2011+ R57 Cooper S Convertbibles, and 2011+ R60 Cooper S COUNTRYMAN, see G2NME4605
Some states (like California) have ever tightening requirements for emissions testing and inspections. Always check your local regulations on compliance for street use.
Here is a link to an article that explains the benefits of the Oil Catch Can.