Custom Cartridges / Extending the SFRA

Hello DEVS! I'm totally new with CC and currently having 2 specific issues when extending the SFRA, could anybody please shed some light on the following?

Steps taken:

1. Create a new cartridge using sgmf-scripts ("paths" key in my package.json is OK)
2. Create a new controller (e.g. CustomerService) and its template
3. Create a tiny client script (i.e. JQuery's dom ready + a console.log 'ready' message)
4. Create a 'main.scss' file which uses the "base" alias from the path key in package.json (i.e. @import "base/variables")
5. Compile JS: OK, no errors

Issue #1: even thought compilation is OK, after uploading my cartridge and setting correctly the path in BM, the storefront always shows "Pipeline not found (Home) for current domain (Sites-RefArch-Site)".

Issue #2: when trying to compile scss, the "base" path is not found, obviously the path key is either not working properly or simply being ignored.

Notes:

• I'm on the path of the DEV Certification, so I'm not using the new typescript repos neither the webpack builder.
• sgmf-scripts v2.4.1
• Example provided from this video https://share.vidyard.com/watch/ASVVEWfhkJ2uPDeoxbosL3 (https://github.com/jorgehernandezSF/sfra_demo) doesn't work either, exact same result...

Any help and or tips are truly appreciated.

Cheers!