We are both in agreement brother on all of the above, especially about catch cans, I'll let you rest up and feel better. We'll chat privately about this, I feel a ProVent100 added to the OEM setup would be vastly beneficial to M54's, the question is the cleanest way to plumb, mount, and drain (do we add a "T" to the CCV drain line and have 2 drains going to one dipstick guide tube, etc)

Will look at the specs of the 100 and the 150, and start theorizing. With a working cold weather CCV system, I think the ProVent will be a positive to be working in conjunction.

Both drains should be below oil level, BEFORE they tee. If not, pressure will equalize and won't allow for proper draining.

You may have to find or create a port on the sump. Luckily the M62 is provisioned for twin drains RealOEM.com - Online BMW Parts Catalog

One last thought about oil draining... make the drain as short and vertical as you can get but absolutely enter the sump below oil level.

Mishimoto just came out with on for the N54:

http://www.turn14.com/shownews.php?id=4215

just an update on my catch can, it is working great ,but I am upgrading to this baffled catch can,it even has a dipstick to check fluid level which I thought was cool too.
what are your opinions on this one, looks a lot nicer than the other catch can I got and I like the baffled idea.

^Picture would be helpful. Although nowadays people are enjoying the direct PCV connection that BavarianE39 posted last year, very simple and no moisture to collect in the catch can.

oops here ya go a link. Add W1 Black Baffled Universal Aluminum Oil Catch Tank Can Reservoir Tank Ver 1 | eBay

just installed the baffled catch above, a huge improvement not to big or bulky, a lot cleaner looking , like the idea of the dip stick to check level in the can, also how easy it is to unscrew the bottom canister by hand, like an oil filter. its sweet and extremely happy with it.very heavy gage aluminum construction campared to my old catch can.

Just installed my catch can. Here are some pictures for those more visual.
The only thing, it doesn't have an air filter opening on the top. Not sure how bad that is

https://i.ibb.co/Rj3B899/20200320-000659.jpg https://i.ibb.co/vj0ZvCB/20200319-234423.jpg https://i.ibb.co/qm6FkqW/20200319-222108.jpg https://i.ibb.co/rkv5BPf/20200319-222102.jpg https://i.ibb.co/bPDNqh8/20200319-222055.jpg https://i.ibb.co/Z1LQZwz/20200319-221730.jpg https://i.ibb.co/VjDvc7s/20200319-221316.jpg https://i.ibb.co/89NM9W3/20200319-220636.jpg https://i.ibb.co/ygJJS2y/20200319-214121.jpg https://i.ibb.co/5j2Q1Cj/20200319-215740.jpg https://i.ibb.co/ZSnGtH4/20200319-212642.jpg https://i.ibb.co/1QLgKfv/20200319-214114.jpg

I put about 70000km on my engine with my catch can. Not the filter type ,no issues.still running strong .