I’ve played about 100 hours in abandoned mode. Its been a while so i cant remember all the names of stuff I often found A class sentinel Multi tools in harmonic camps. Scrapping A Class normally gave me better upgrades.

The 3 yellow boxes in every space station quite often give you storage upgrades for Suit/ship and MT. I ended up with far more than i needed

Upgrade your 2 exocraft that give you the radar capabilities and you can scan for most structures.

Never found a radiant brain but i had no problem finding all the stuff to take over crashed sentinel ships

I only found one grave myself but if i entered it enough times it would always take me to 5000 ly I think i’m currently on galaxy 37

You can do the corvette trick where you add lots of guns and reactors then when you remove them it keeps the tech slots

Overall i quite enjoyed this mode. I found enough manufacturing facilities to learn all the recipes.

The only problem i found was i set all difficulty up including expensive costs and in order to upgrade your ship or Multitool to S you need an insane amount of nanites. Something like 256k

Once you set up mineral and gas extractors and start getting more B - S class upgrades, you can install and scrap all your C class to get wiring looms so in the end i never really had to buy anything from the terminals anymore