I did some looking around in the TI IBIS zip file and couldn't find the associated IBIS models, so here goes.
SN74ABT241: ADW package
SN74ACT240: DW package
SN74ACT241: DW package
SN74AC241: DW package
I tried using Mentor's Visual IBIS editor, but was cautioned against using it's wizard. Is there a better way? or perhaps a repository of files that I don't know about?
While I'm at it, what's the best way to create a model for ASICs?