Install SPS 2003 in other server;
Backup all databases (_SITE, _PROF and _SERV) of all portals from the old
SPP 2003 server;
Restore in the new server;
Create new portal based on these databases;
Install all the applications you had on the old server;
it supose to work because all the confirguration, content, customization
(made by frontpage) are stored on sql databases.