For a wash, I would thin out the acrylic paint with either water or rubbing alcohol and a drop of dish detergent, this breaks the surface tension and allows it to flow better. I would use a red-brown for Vietnam soil color. I would also use a little darker gray on the cloth walls to deepen the quiting and accentuate the details.
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and i have paintet the helio acordelig too the manual...
If you are speaking about the troop seats, I still disagree and stand by my original statements. There are no metal frames showing on the seat edges. I have ridden in many a Huey in my 11 years in the US Army. They all had the same style seats, no metal showing around the edges. And you are missing the vertical support posts that hold them up (I have built this kit multiple times as well) they are parts #20 in the instructions.
Here are a couple of photos of the rear seats to show how they look.
You will notice the vertical upright supports and the only metal rod is the curved bar support under the seat.
Hope these help to illustrate my point better.
Good luck, it is coming along nicely, few tweaks and it can be great.