I'm not a miniaturist, but I have made a doll quilt or two in my time, and I've done some Dear Jane blocks that have teeny tiny pieces. Triangles in that scale would be tricky to do. The seam allowances would look really bulky at that scale and it will appear lumpy.
If it were me, I would most likely pull out some heat and bond, a pair of tweezers and my Clover mini iron and fuse the pieces down. Another option might be to make a little cheater quilt by drawing a quilt design onto some muslin and coloring it in with some pigma pens.