An Ironman facing the Ark?
Hmmm... the Ark is not something to be conquered in a single visit. One should expect incremental progress over the course of several visits and let me explain my rationale.
1. Some of the most useful things for surviving the ark are random drops in the ark. The best of the armor and weapons for surviving the ark may not show up in any one visit to the ark. Or even five visits. And batteries are random drops. You need at least 15 batteries to advance certain milestones in the game, and you may want additional batteries for other uses (powering weapons and using the med centers.)
2. The Ark has several different quest items in it, difficult to get all in a single go.
3. You may want to think about each visit to the Ark in terms of, "Have I gathered something that will help on my next visit?" i.e. A great piece of armor or a great weapon or a quest item or a good stock of batteries, etc.
Other things to think about:
1. Potions that you might not normally think about may have uses. Invisibility. Shock resistance. Fire resistance.
2. Finding the ring of the star traveler in a random drop will do wonders towards your ability to survive hits from the Steel Wizards. (Let's not even talk about Battle Droids!) Your 59 shock resistance is a great start, but you can still get lasered to death pretty quickly.
3. Be ready to switch back and forth armor from when you primarily fighting spiders and when you are fighting enemies that can laser you. The former needs AC. The latter needs shock resistance and spirit resistance. Both explode when you kill them, but it's easier to use fire resistance when fighting spiders than wizards. That's because you can't have great fire resistance easily while having great shock/spirit resistance.
4. If you use the scroll of recall and you robbed Golden Cove Bank earlier in the game, be careful that Golden Cove guards don't kill you after you escape from a deadly situation aboard the Ark. Heck, even the street thieves could kil you if you are weakened.
5. I finished the Ark with the peaceful ending -- but I died A LOT in the arc beforehand. Doing the Ark in Ironman mode seems crazy. Completely cray cray. But I wish you luck. You might want to prepare more first, but still, I wish you luck.