Re: Forgive me if this was covered already but its golem tim
You can also store into a golem using a high magic, each day costs you 5 points of high magic. If you're a celestial scholar, it's a good way to save components and the hassle of finding the scrolls.
But I agree with Mike Strauss, 28 ranks of rit (if you're going to build the highest level), 30 components, a scroll and a catalyst (plus the Preserve and 10? more components if you want it to last more than a year) will take you quite a while to gather on your own. 28 ranks of rit alone, for a scholar, is almost 9 levels of build (84 BP), and you have to get at least a pencil (another 73 build), plus your prereqs (another 7). So you're looking at 164 build minimum to cast it by yourself, if you've got not a single other skill on your card. I'd suggest having other people help cast the golem, especially if you're part of a guild or team. That way if you can't be in it for a weekend, someone else can use it via high magic storing, or at least give it orders if you somehow get banished out of it.
Being in a golem isn't something that makes you immune to harm, however. You aren't affected by life/death, or any necro or healing, but a few people swinging swords on you will kill you fast. And unless you spend 20 points of your possible 60 to make it a golem "suit", when the golem reaches 0 body, you're going to rez. No cure light, no life spell, just a pile of dust and a walk to wait for an invested member of your local Permanent Earth Circle. Shatters and Destroys can also eat away at your body, at 15 and 30 points of damage, respectively. 5 Destroys, if you're not sporting armor, and *poof*. And these are just the skills that PCs have. Acids, explosive traps, vengeances, Warder Glyphs with the right kinds of damage output... If you're looking for one because people attack you physically for talking, you're putting yourself in more danger.
And Celestial casters can do plenty to hurt a golem. If I see a flame golem, I'm going to try my ice wand on it, to see if that hurts it. I'll see what elements it's immune to, and what it's hurt or healed by. I've also got Shatters, Destroys, Enflames, and Prisons (so I can Prison and KB the golem, putting the golem at 0 body, destroying it, if it's not healed by them). A caster with a 4 column and wand charges can take out a golem, so long as some of that 4-block is something that hurts the construct, and they're not immune/healed to every element. Even if the construct has innate reflect, it's not going to be able to reflect my wand charges, and I'll be able to do some serious damage. And if I have my own reflects or Banes, that gets spells through the innate reflect, and the golem can't have spell shields (but they can have dodges or cloaks or banes).
Golems are situationally useful, and situationally deadly. I've seen 25th+ level players in golems run from certain fights, BBGs, and situations, because they know the wrong thing will get them rezzed.
Join your local Celestial guild, or send in plot writeups to your local chapters looking for more information IG (if there are universities, or libraries you can go visit to study).