I’ve been reading these kind of threads for years, and every post has value - but just be aware that none of the ideas will work in every situation, mostly because of the variation in engine and accessory installations. Somethign as simple as how you run your spark plug wires will change your access to the oil filter mounting point. Other variations include; type of pil filter mount, how close the firewall is to the back of the engine, type of prop governor, how the prop governor cable is mounted, choice of oil filter (check valve or not), how your oil cooler lines are run, where the oil cooler is mounted, which accessory case you have (which determines where the oil cooler lines come out.....), engine mount design, etc, etc, etc....
I’ve got a Form-A-Funnel, cut out milk jugs, various disposable Tupperware-type containers, and custom drip tray. Nothing works in very situation, but all have their place in the “box of ideas”.
I have worked on wide open engines where I never spill a drop and tight installations, where the only thing you can do is stuff rags under the filter and catch as much oil there as you can while flipping the filter as quickly as possible to stop it dripping.
The bottom line is that when people post ideas, they are all good - they are all something to look at to see if they will work for you. But don’t be disappointed if they don’t - your installation may vary. Remember - there is a rumor that Lycoming once made two identical motors - but no one has ever proven the rumor to be true. When you add the variations of installation (remember, these are Experimental aircraft....), the chance that you’ll have to come up with your own variation on all these ideas is is high.
Meanwhile, it all makes me appreciate my little turbine engine - I suck the 300 CC of oil out with a syringe through the dipstick hole, and squirt another 300 CC in and the screen never has oil in it, so no mess there - and that’s that!
Paul