I was looking at another mod with a modern theme and wondered why we don't have these in IC2? We can make carbon composite armor, but doors and ladders are still wood?
I think that a glass door could be made from 6 reinforced glass, in the same crafting pattern as other doors. As for a metal ladder, it could honestly be made of bronze, iron, or refined iron - but iron is probably the best choice. Because it's more costly than sticks and the only real difference in game is cosmetic, it should yield more sections for the ingots used to craft it (perhaps 8 each instead of 2?)