Hi @April_Donan1! I think your questions were mostly answered in other chats but are you still looking for those plans? If so just tell us what you are looking for and we can probably tell (or hint if you prefer) where to look.
As for getting to the tool box you could try setting up a raid of the L’s basement on this topic:
can i please have some help finding the contain ment tanks please
When you go into the Isle Mines, the containment tanks room is the first right turn. No way to sneak past the enemies blocking the hallway, so take a friend if you aren't great at solo-fighting.