I could progress a little bit more last weekend:

The node is running, balance is obtained and I am now setting up the code to fund and open a first channel. You can see the most recent code in the lightning-wallet-home branch.

The lightning_node_repository and seed_repository can be used like that in any other wallets too, it is decoupled completely from the app code itself.

Next steps I hope to have after next weekend are:

Any help or feedback is very welcome!