About system requirements: not sure how much ram is needed but I run node on machine with 4 gigabytes (maybe 32 gigabytes is for building hive from source. Also if you have limited disk space - you can run smth like "pruned" node in bitcoin - don't store all block log at all or store only 1milion last blocks. To run "pruned" node you must add "block-log-split = 0" (or "block-log-split = 1" for one milion blocks in storage) in config.ini. Massive sync from 0 takes like 1-2 days nowadays. It should be possible to run node on raspberry pi with external ssd like 50gigs, not tested this thought raspberry pi is ARM not sure if this will work smoothly. But for full block_log it takes like 1TB.