Actually, using black outlines is just abhorrent for such small scale drawings. Whereas in SB and FD outlines help to define drawing and better show it's borders, in 1.5px scale black outlines will dominate the whole figure. Furthermore, when drawing parts like weapons black outlines are often the sole thing which can be seen at the drawing due to complete shadowing of another color by dominant black outline too wide due to small dimensions.
Shortly Char will be posting proposals for the official scale/style. Stay tuned.
Black outlines of the entire profile will be required, but still up in the air if this includes all the interior lines. Weapons are best shown without dominant black lines (I agree on this).