Vaal Temple Planner
Place rooms and paths; tiers, conversions and power work themselves out✓ Checked against game files · 0.5.5
From the game files: which rooms upgrade and convert each room, how much power it needs, and every tier's effect (see the cheat sheet).
From the community (poe2wiki's Atziri's Temple page and open planners), since the files don't hold them: the 9 × 9 grid with the Foyer below and Atziri above, paths linking to every neighbour while two rooms link only if one upgrades or converts the other, rooms counting only when linked back to the Foyer, tiers capped at 3 (4 with Transcendent Progress), the Commander's tier being its Garrisons, and a Generator powering rooms along 2 + its tier path cells. Path shapes and the order you may place things in aren't enforced — this plans the finished layout.