1) Check http://www.winuae.net
for latest version wich has near perfect cd32/cdtv emulation.
2) i'm not sure what you mean with snapshots. If you are talking about cd images (.iso and the likes) they are somewhere on the net but don't ask me where.
3) The diffrence is so huge that i'm not going to venture into trying to explain it. Partially because i have little to no experience with Whdload.
4) You might want to take a look at the whdload website for that. Http://www.whdload.de
5) No idea on that, might be possible. Good luck on finding out and obtaining it. And keep us posted on your progress.