You will find the gun community as helpful as Bitcoin is.
Andrew’s customer leather is old but very experienced. You may find inspiration in his designs.(www.andrewsleather.com)
Trex is modern kadex manufacture and open sourced their 3D scans.
(
https://www.trex-arms.com/3d-scan-library-834). The 3D scans aren’t printable because they are point clouds.
Gatalog and ctrl pew have 3D printable clones if you want 3D models. (
https://3dgunbuilder.com/the-gatalog/ and
https://ctrlpew.com)