2-no you don't need them they are needed only to start application and games from cd/dvd it's necessary only for the ps2 bios
4-yes you should simple edit the data files of memory manager and upload the app according to your settings but i don't have matrix and i can't be more specific
ps2os betatester, ps2tools codev, hdldump frontend dev
6 sony mc w/ps2os 0.2.4, hdl, ps2rmp1.50,ps2mp3...
na+hd maxtor diamondmax 7200 120GB
PS2 SCPH-30004R V6 ÐM$3 V2 firm 2.4 B.4
PS2 SCPH-50003 V9 ÐM$4 PRO firm toxic os 0.1