It should compile to 32 bit, above the poster says he is using it on XP, which is generally 32 bit.
Problem is that it would need a lot of porting. As I mentioned, we have some of the needed stuff such as the widgets but there are classes that need porting and who knows what else. I don't have the skills to compile iceweasel, if someone else did, I could probably compile iceape and icedove. Just like with our Mozilla where once Firefox was done, I could do SM and TB, though they still have a few bugs such as oauth2 being broke.