Did a rough map for summit, something that incorporates both the original walkthrough and the latest versions. Long time off till it could see development, but just had some ideas on the Summit.
The flow of gameplay, could start from the lift, a puzzle in ascent could be changed so you need to re-wire a control/power box, the control could be in the lift, the mechanism is a bit rusted so jams just below the top.
A fence could line the edge, with a gate that's very securely locked, with the stairs present, which could give realistic access for raptors.
Play heads to the radio, find that the antenna needs re-configuring/repairing, at this point the player hears creaking, heads out to see the gate is open, raptor pops out from behind a shed. If the player headed that way, they'd find the stairs partially collapsed, a gap too big jump. Otherwise the player heads up a small rock ramp and up metal framework for the most part, like a large structure taking you right up to the flat area with the helipad, they cross this area to head up more stairs to the antenna and a weather shack. The antenna needs a new component, so head to the shack grab a spare, fix the antenna.
Then the player just needs to head back down, radio for help, then get back to the helipad. In the meantime more raptors have arrived and the 'big one' fight could occur in the crater, after its dead, the player just needs to get the helicopter, avoiding raptors back up the way.