ALL SPOILER, KINDA: Mainly, if you read this post you’ll see how I navigated my way to what I consider a desirable “Ending” but if you know Fallout 4 you probably know that the ending isn’t the end of the game. So, if you haven’t begun the Institute quest line, you prolly don’t want to read this post.

Father holds Director Meeting and makes me the Director
In my last post I mulled the problem of the Mass Fusion quest. Long ago I decided that the Institute is an awful faction and I always choose to go to war with them. That said, it’s useful to do several Institute quests, but when you are asked to do Mass Fusion you have to make a decision that will an enemy of one of your allied factions. In my case that would be the Brotherhood of Steel. So, I put off making a decision until Level 82, and instead of doing Mass Fusion I killed an Institute NPC, namely Father himself. It sounds simple but once you kill someone, your special PipBoy mod to fast travel out of the Institute no longer works.
Nonetheless, I got out and soon the Institute attacked The Castle in multiple waves. And soon we Minuteman (coolest of all mods!) folk decided to destroy the Institute and we did (See below).

That’s me in the foreground, ready to push the button

I pushed the button and in a massive explosion the Institute’s wave of terror ends.
The end result of my maneuvering around Mass Fusion is that I’ve destroyed the Institute and am still in good standing with the Minutemen, Brotherhood and Railroad factions. In fact, I’ve gone on to become a Brotherhood Paladin. I’d heard this could be done but it was trickier than I realized. I’m very glad I took this path.
I’ve already begun Far Harbor and completed Automaton at Level 88. More later.