1.43 was a Mac only release that, strangely enough, doesn't fully work on either PowerPC or Intel Macintoshes (I've tried, several times).
Did you say it uses a lot of Legacy specific hacks?What kind of hacks?As you may recall, T.U.C.Q. was Legacy specific and made heavy use of hacks before it was converted over to GZDooM.Maybe it is possible to convert it to GZDooM.