HaloMods "Classic" Read-only Archive

Which makes running the beta on a modded 360 possible? If i'm acting annoying please deal with me im new to this whole modding scene.

I dont understand this "Unsigned Code" stuff. Cant the unsigned code be run with a modded xbox? Please explain because I don't want to look like a noob and bump a two month old topic.

Is it possible in any shape or form, legal or illegal, to get the Halo 3 Beta and get it working on a modded xbox 360? I know you can't play anything on it (i.e matchmaking, customs) but if it is possible can you be able to edit the source or something to have customs enabled? Thanks. ~iTz