I am ripping them with Tahaxan, narctool, and CrystalTile2. With Tahaxan, I can extract the compressed files that contain the map images, then decompress them with narctool, reinsert them, decompressed, with CrystalTile2, then view them with Tahaxan. I've tried this with other DS games and had no such luck.
When I said I was going to scale them up 200%, I said this because in the actual game they are at 200%. This would also make it easier to put sprites and Item Blocks in.
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Games I have mapped--Zombies Ate My Neighbors (SNES), Mario Party 3 (N64), Super Mario Bros Deluxe (GBC), New Super Mario Bros. (DS), Mario Kart DS (DS)