Or you could port Kdrive, and, say, mlvwm(Macintosh Like Virtual Window Manager.)
I don't know what the efficiency of mlvwm is, but kdrive is great, I've personally used it with twm on a 486 with 4mb of RAM and it was quite responsive.
I don't know what the efficiency of mlvwm is, but kdrive is great, I've personally used it with twm on a 486 with 4mb of RAM and it was quite responsive.