Considering the need to keep dependencies up-to-date in the POW-demo, it is better to refactor this tool using ethers.js rather than the declining-in-popularity web3.js.
Ethers.js is faster, more versatile, and widely adopted by developers.

I've implemented the PoW minting feature that SKALE offers for interacting with contracts without balance (faucet in our case), but some things were not clear straight away from the repository/code and lots of research was done until the solution was implemented.

I would suggest the following thing, and I am willing to open a PR when I have more time:

1. Better high level documentation on what this feature is and how it works.
2. Better code styling, potentially migrating the code to typescript.
3. Adding instructions for building the pow scripts using webpack.
4. Creating a proof of concept in react (create-react-app).

Also, it seems that the demo is web3 dependent. I've tried porting the pow implementation to use ethers.js using keccak256 for hashing instead of the web3's sha3 function. The PoW candidate is successfully found, but the transactions are failing with that candidate because of not enough gas issue (unsuccessful PoW verification). I think adding an ethers implementation would also be helpful. This is because lots of projects use ethers and web3 is just a bloat when used for hashing only.