I known of one light weight laptop with Cyber Aladdin-T chipset, Toshiba Portege 2000(dynabook SS 2000m in Japan), it's very thin and only 1.18kg, with a SB compatible AC97 chip.
There are two problem I am not sure about
1.the cyber blade XP IGP performance. There's a video on Google that compares it with Riva TNT2, both non integrated cards, and the Cyber blade acts like shit. I don't think it will perform any better on a laptop.
2.the laptop itself is XP pre-installed, although Toshiba provided win98 drivers for it, it's hard to install win98 since it's so lightweighted that it has no CD Floppy drive, nor can it boot from USB. Probably a PCMCIA CD-ROM is needed.
Another good one I noted is Toshiba satellite 2410, with a GeForce go 420 card, which is better than 2805, only one step away from FX 5200.
Toshiba P25 series have a FX 5200 card but no official drivers (chipset, sound, video, nothing) for win98, besides I don't find one laptop on the net.
So 2410 is on top of my list now.
Btw Toshiba Portege 3490CT is very much like my satellite pro 4300, Yamaha sound, S3 savage video, and its light weight, about 1.5kg if I remember.
IBM a20p is on my list too, it has a high res LCD and an ATI card equivalent to GeForce 2 go.
Toshiba Satellite Pro 4300 - Yamaha YMF744
Toshiba Satellite 2805-S501 - Yamaha YMF754
Compaq Presario 1805 - ESS ES1869
IBM Thinkpad A21p - Crystal Semiconductor CS4624