How does it work with module measurements and wall thickness

[NatBat]

Hi, I'm going to build a partition wall with studs+OSB+gypsum and I've calculated that the wall will be either 20+26+45=91 mm or 116 mm depending on whether I use 70 or 45 studs. I think 45 studs sound weak but could work with OSB+gypsum, while 116 mm and 70 mm I haven't managed to find a matching door for. Does the module dimensions need to match the wall thickness exactly? It's feeling a bit hopeless right now to figure this out. I want a specific door that happens to have module dimensions 9x21, stating it's 68 mm. Well, I'm not going to build a wall that's 68 mm. There must be some information gap here now, I think. Hope that some kind, more experienced person will enlighten me on how all this information fits together. How does one solve this in a smooth way?
Thanks in advance.

 

[sinuslinus]

You install a salningslist so it covers the entire wall thickness or buy a 118 mm frame for 70+osb+gips.

https://www.bygghemma.se/hus-och-by...dorr/innerdorrskarm-swedoor-pluskarm/p-340276