This is strange. The last few days I tried over and over to create my own Super Mario Kart by injecting it into the DKC 2 wad, and I failed each and every time: I always ended up with a wad file of 6KB (and I know a lot of you have this same kind of problem). I was sure I used the right tools with the correct versions, and that I had installed every file in the proper map. I even got a complete filled map from someone else who did have success, and it was 100% the same as my map!!!
Then I just quit doing it and went frustrated from my computerroom to the living room. However, after an hour or so I decided to give it another go, and I took the laptop (with XP installed) which is in the living room. I copied the map with all the files via my network from my PC on to the laptop and give it a go. And surprise, surprise, at the very first attempt on my laptop I got a wad file with the proper size!!!!
So, bottom line, I suppose the problem for a lot of us is (or was) in the way Windows XP is installed or so. Unfortunately I am no windows expert, so I really don't know why my attempts on my PC fail, but succeed on my laptop.
Perhaps someone else has an answer.
Unfortunately I can't test my newly made WAD file at the moment, because my daughter is playing some game of Bowling on the Wii, and I don't dare to disturb her. But I will report whether my WAD file runs properly later.