[Allow for railjack scrapping without owning a ship]

OP, i have found that when you click the prompt to scrap because you are over your limit that button for sell or scrap doesn't apear until you have scrapped enough to take you below the limit. i.e. if your at 37 you have to select 8 things to get the scrap/sell prompt. hope that works for yeh

[Eidolon hunting]

You mean the Vectis? If so, its a good one if modded properly. You might need a few arcanes too though. Rubico and lanka are better i think. Lanka hits harder and can be fast with the right setup. Rubico is faster and has a nice feel when you fire it. Both will get rid of the Synovia right quick though.