I use 3D scans to model an inlet manifold for my mini and guide you through every single step.
If you want to model along side then the files I used for this are available on the link below...
https://www.makingformotorsport.com/projects1/3d-modelling-from-3d-scans
If you'd like to support the channel please check out the Patreon...
https://www.patreon.com/Makingformotorsport
0:00 - Introduction
1:21 - Getting the scans and 1st alignment
4:24 - Opening fusion and loading scans
6:15 - Looking for clashes
8:00 - Reducing and simplifying the mesh
10:55 - Creating the working planes
13:55 - Getting information from the mesh
19:20 - Engine side flange
21:25 - Modelling the actual manifold
26.20 - Making, fitting and testing
27:48 - Round up