Am I supposed to do a suitless Norfair run? I only have 2 E-Tanks, and even Super Metroid: Impossible gave you 3 to make the same attempt. I'm either missing a tank somewhere, or I need to find another route. Spazer was my last item, and it doesn't appear that I can enter Kraids lair yet.
*edit* Whoops, I forgot I had worked on that area, apparently it wasn't the original unmodified rooms. So as to your question, you should have found 3 energy tanks outside Norfair, and a fourth obvious one in Norfair. There should be a max total of 60 missiles (I think) that can be obtained up to the green bubble room of Norfair, but I'm not sure because I'm replaying through my hack-in-progress because I forgot what I have finished so far.
Alright, I've now played this game through again to where I was stuck (Norfair main-street), with 2 E-Tanks prior. I like the design and challenges that you've incorporated into this, but I've come upon something now that would be a semi-permastuck situation. If you continue onto Norfair right after getting the first pack of Super-Missiles, you're stuck. Permanently. You won't have enough E-Tanks to attempt the Hell-Run, and you can't get back through the blue-gate to Green-Brinstar to collect the E-Tanks you need (PB Blocks at the Top of the Red-Brinstar Shaft blocks your way there, too). With your level-design, not allowing you to quickly get back up the Pink-Brinstar area from the bottom portion, you're forced to go back through Spore-Spawns area. The problem with this, is this is very counter-intuitive (As there's usually a SM or Crumble block that doesn't allow you to reenter Spore-Spawn's area from the exit) and doesn't give you the idea that you're supposed to go back for more upgrades before continuing on (into the inevitable perma-stuck, once you've passed the blue-gate point of no return). What I would suggest to partially avoid this problem, is to put a Power-Missile door in the middle of Pink Brinstar, blocking the bottom portion until after you defeat spore-spawn, but it will clue the player into going back to Green-Brinstar because of where you've placed the first pack of PM's. This, however, still won't fix the issue being perma-stuck if you go past the blue-gate. Obviously it's your hack, and I don't want you to have to mess with your design to make it work. But labeling your hack v0.4 still implies that you're working out the kinks.