I would definitely like to see some of these super fancy technological facilities the scientists managed to produce power armor, handheld plasma weaponry, and interdimensional portals with, but I agree being able to build these things using regular tools after reading a few books is extraordinarily unlikely.
Have some thoughts on the subject off the top of my head:
Assuming most or all of these facilities (advanced factories, plasma containment components, hydrogen super-compressors, etc) have taken significant damage, and the components all being extremely advanced and/or experimental, you’d probably have to scavenge through multiple labs just to get the parts necessary to get a single working machine (And perhaps power it somehow).
Of course, you’d have no idea how to build or repair any of these things, and that information is probably all on a secure server that is no longer connected to the network (Though a lab finale might have a computer with some information/maps in it). You’d have to find one of the server backups (Probably deep underground, full of robots and turrets) and try to hack into it without activating a lockdown and getting mobbed by dozens of Explosive Manhacks (Because a flying drone made of spinning blades isn’t terrible enough until it also explodes into a ball of fire and shrapnel when you disable it).
Experimental future-tech isn’t a DIY project, and when you consider the level of security on the random labs they have all over the country-side I imagine their databases would be even harder to get into (An id card alone probably wouldn’t cut it).
