Editing A Cheat Device

Hope this is in the right place, sorry if it isn't.

I'm just wondering what sort of work is involved in editing an already existing cheat device? For example, one of the old Xploder V1 or something.

I mean editing and customising the interface that gets displayed on the ps2, changing the encryption of the codes (Hex on Xploder), etc.

As you can tell I'm new here, I'm interested in this though but I don't wanna get annoying and start stepping on peoples toes. This would never be for public distribution or anything that I think would antagonize Blaze, it's just for home use.

Thanks for any info you can give me!