Thanks everybody for the response and the constructive comments.
Backdroft: I was just lazy not drilling a hole in the gun, and you're right that the gap between the turret and the hull is definitly to large. I think it was that way on the original - not that good - Arifix kit.
Doog: the dio base is too sunk into the frame. I discovered that after I almost was finished. Have the desert floor higher would be far better. Regarding the color, I'm not sure what the exact color were on the M3 Grant, I think I followed the color of some other model I saw on the internet. I really like building dios in this scale, since it don't take so much time to finish them. When I first took up the hobby some three yeras ago, after an 13 years pause, I did a bunch of dios in this scale, just for practicing on the painting techniques. I also posted some pics of them on this Forum, and I think they still are here somewere.(I'm not to fond of the results though).
Madmike: I painted the whole thing with a brush, since I don't yet own a airbrush. I used the old Humbrol Acrylics and the some oil paints for the wheathering.
/Tony aka bultenibo