In first case sorry, I do not speak German. (and my english is not perfect )
Nick wrote to me with some questions and the best solution for all will be new thread here.
I want good dual oil catch can for my car, but there are only two way, cheap from the China (with steel wool) or expensive from USA (Mishimoto,Radium Engineering) I designed and made Oil catch tank (can) for my S2000. The inspiration was Mishimoto baffled oil catch can, which is sold the equivalent of about €270 per piece. (So that dual solution cost about €550).
Material "container" is aluminum, stainless steel fasteners, the holder steel sheet. For filtering is used air filter from air compressors. Same system as use Mishomoto. Weakness for my solution is- It do not have check system... however you can easily unscrew lower part of container and make check.
Holder for S2000 is in area where S2000 has cruise control. I do not have it on car yet, but you can see holder on position and mounted. For another location or car I can make special holder.
I have thread in selling, with photos and video my "homemade" dual oil catch tank (can) Meine "hausgemachten" Dual-Öl-Fang Tank (kann)
I made some upgrades with holder... I will add photos.