You're using the old way to convey info to people on MOBAFire. I think you should put out sections, unless that really is just your style, but the guide's great, +1

You've put in a lot of effort here and I hope to see this guide rise up in time. +1 from me my friend, good work.

Great guide, helped me alot thanks man :)

Your coding is good and it's obvious you know generally how to make a guide, so good job. As for your build I definitely recommend building your Regrowth Pendant into a philosopher's stone ASAP for the gold component and the mana regen (something nautilus lacks without blue buff). Then you can get your boots and Heart of Gold so you don't get behind when roaming and ganking. If you build both those into Shurelya's Battlesong and Locket of the Iron Solari respectively, you'll be a very effective support initiator and enabler for your team. And while your Titan's Wrath scales off bonus health making Warmog's Armor seem enticing, it is actually better to just build resistances which will extend the duration of your shield by a larger effective amount that flat health alone, try it I promise it's true. So for that Frozen Heart and Force of Nature will give him everything he needs to round out his build (cooldown reduction, movement speed, regeneration, and of course armour and magic resist.

Good start though, PM me when you've updated and I'll be happy to give you a vote! Nautilus is such a fun champion.