If people are interested I can sent the 3D-file for the 90-120mm adapter.
Adapter file would be appreciated! As others suggested, you can upload on Thingiverse or Printables. If you get enough downloads on the latter page, you will get free filament, too.

Do mind I added some pictures so you have a better idea, it does need a small cutting on the top. But with a steady hand and a Dremel it is easy peasy
https://i.imgur.com/Kd3D2Q9.jpegOhhh, you need to modify the chassis? It would be great if the model somehow screwed into existing holes of Apollo without modifications. :/
This would definitely affect resale value, right?
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I preferred to cut the chassis, instead of narrowing the funnel in order to keep flow and reduce the risk of noises due to turbulence.