It looks much harder than it is! All you need are 42 paper pieced snail trail blocks, one of the easiest blocks for paper piecing.
In my case 14 brown/grey and another 14 in brown/grey as mirror image to the first 14 and 7 in orange/grey and again 7 mirror images of that.
If you look at the legs you can see that they are all the same: two turning to the right, two to the left.
I printed the paper piecing templetes and colored one of each categorie by hand and then copied the number needed. Then I put it on the floor, was able to see the monkeys and sewed one by one. The last row of triangles I pinned to it and then I could see which four had to go together for the bodies ore the background.
Well, I guess I can sew better than explaining..........lol