A lot has been done in the last few months. I did some refinements to my last project Sievphou Seksaa, redraw some glyphs and recoded the typographic features. As for now, Sievphou Seksaa supports modern Khmer as well as some older orthographic features.
During my studies of the Khmer script, I came across a handwritten story that I thought would be great to typeset with modern technologies, since the style of the handwriting is beautiful but also some details of the glyphs are somewhat distorted. This folk tale is written in an old-style orthography with some special features one wouldn't find anymore in modern Khmer writing. This is why I added support for those features to Sievphou Seksaa.
When I designed Sievphou Seksaa, I relied on an older textbook for writing lessons. The printing is a bit dirty and the letterforms are not too clear. So as for the first sketch, I drew some of the glyphs just roughly and had to refine some details of the curves and edges.
I will upload some examples of these new developments in the nearer future. Stay tuned!