I used a custom modified version of the Halcyon Days texture pack as well as Optifine, Worldedit, GLSL shaders mod, and the SEUS shaderpack.
System specs are:
Windows 7, Intel Core i7 3.50GHz (8 CPUs), 16GB RAM, NVIDIA GeForce GTX 570 4GB Memory
It was a bit of a trick to recreate the scene as well as keep it all loaded at once. The shader mod only renders shadows of blocks within a certain distance of the player so I had to do some fancy brickwork to manage the shadows. I also killed about 5,000 bats to get the shot free of them. I tried playing with my FOV and window size to get the angled camera of the original scene but it left it looking too distorted for my taste. I hope everyone likes it!