private blockchain with RPi

hi
I am just starting on the blockchain, bitcoin etc... I read 'Mastering BitCoin...2nd Edition' from O'reilly to start with and some articles from the internet.
I want to build my own little blockchain network using two RaspberryPi. I am planning to have two c++ programs running on each RaspberryPi, this C++ program will generate some data. This data becomes payload for the next block. One of the two RaspberryPi will mine it, add it to its blockchain and publish the new block, the other one will accept and add to the chain.

My question is
1. Is it possible to do with libbitcoin on RaspberryPi? With libbitcoin, I have the impression that I cannot put arbitrary type of data in the block.
2. Or ethereum on RaspberryPi?

Thanks in advance for any guidance.

bitMoreCurious