While neat, the last thing that Legos are in comparison to Minis is cheap.
Although you may be saying something interesting here, I'll never know due to the unreadable font you've chosen. For the love of our eyes, please choose a font without serifs! And a little bigger wouldn't hurt either.I just think back to when I was a kid, had buckets of lego and used to build houses and spaceships.
Why not put that creativity to work and build D&D Dungeons.
Some of the Dungeon Wall Sets you can buy can be pretty expensive but do look cool. Why not just mimic the idea with Grey / Black Lego Bricks.
I agree the idea of making Lego Minis (which although is my suggestion is not what I think the post I linked to was doing, I think they were just being artistic) is a little rough around the edges but expanding the idea to the 3d enviroment of a D&D dungeon sounds intriguing.
You can even make a roof, that whilst made from Lego would have the bottom pieces covered with paper or card so its easy to lift off. That way if your group is entering a room, rather than just have everything open plan from a birds eye view, you can cover certain areas up and even better, pre-place the mini's inside so that when the roof opens up inside is the Monster Group.
Am I crazy for thinking that Lego as a substitute for expensive craft models is a good idea for D&D Dungeon Design?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.