To put it another way, I'm staying true to the id level, not trying to modify it and make it act like a non-Doom level just because I can.
As for rendering speed, fill rate is the greatest inhibiting factor when the graphics get this complex. My "Low end" test laptop is equipped with a GeForce 7400, whose fill rate is alot poorer than a 6600. It won't run acceptably at 1440x900, the laptop's main resolution, but runs fine simply by dropping down to 1280x800. So any card over a 6600 should run it fine, and if it lags a bit, just drop resolution a step and the framerate shoots up surprisingly. Anything Geforce 8600 and above should run it smooth as silk at most any resolution.
There is a team doing Doom Episode 2? Bummer, didn't know that. Oh well, mine will be out first. ^_^v
Anyway, 'nuff babbling, time to go work on finishing up the architecture. I close by enjoying a glass of penetrating wood finish!

Ben
(Download finished levels at http://www.prodigal-game.com/doomwads.html now!)