Once you make an assembly or get the schematics for it, the schematics for it can never spawn again (and thus once you find all assemblies, you'll never get schematics again). Doing an Ao100 game is a good way to build all the assemblies (the only two assemblies you won't be able to make together in the same run are Nanofiber Skin Armor and Cybernano Armor), and you could do it as a Scavenger to help you get as many mods as quickly as possible. And you can kill yourself once you make enough assemblies if you don't want to do a whole Ao100 run. Or you could spam HNTR games up to the Armory/Deimos Lab as a Scavenger, and get yourself killed once you got some assemblies made. Just creating all the basic assemblies would significantly reduce the chance of schematics spawning, and master assemblies are very rare drops as schematics unless you're playing on Nightmare. Finding all the assemblies will also get you the Technician Diamond badge.
As for the Unchained Court, what part are you having difficulty with? I find it really hard on UV for most builds, though melee builds should have it easiest; grab a berserk, take out the Barons ASAP, destroy their corpses if they weren't killed on the right side, and then camp out in the door on the left side, while shooting at the Formers that come into view. Once the Arena Master comes into view, shoot at him to get his attention if he hasn't already initiated an attack, and then activate run and get a Berserk (while first closing the door if he hasn't already initiated an attack). Then when berserked, just run up to him and click until he dies, then just camp out in the middle and take out the rest of the formers, while gift dropping if you want to attract their attention faster.