I want to do the T90 one of these days.
I don't know if you have ever tried this, but you can use Chalk Pastels for different colors in your weathering. What I do is turn it into powder and then with a mix of water and white glue (about 10% glue) I wet the areas I want to at the powdered chalk. You can use a brush after it's dry to remove some if you have to much. When the model is done you just need to ad a clear dull coat of spray paint to seal it. You can see how it look on my M3 LEE the best. 12jack12.deviantart.com/art/M3…
I have a few that I need to get around to building, Challenger I, Leopard 2A4, Merkava Mk1 and several others.
I was lucky, I found a Hobby Shop going out of business and picked up a few models at 50% off.
It was a nice old time hobby shop that had all kinds of different things.
I could have gotten 50 different kinds of plane models and the same with ships, but the armor stuff had gone quick.