So andrew I know you have lots of spare time but can you give me a hint of what you did for LTSP? etherboot?
I have got the some rom images in ftp://pub/downloads/linuxbios-sdk/images/romimages You also need an elf kernel with sis_lite fb driver patch and follows the ltsp installation guide. Then, you are pretty much set. With recent kernel, the video problem doesn't appear when running X. I think it is a very good news. If I have time, I'll post the my ltsp distro and kernel for people who are interested.
-Andrew