I see your question is 6 months old. Maybe this will help anyone else with a similar problem (this seems unlikely :-)
In my limited experience, SCO Unix data is often found in a subdirectory of the /u filesystem.
In order to find the web-server configuration files, you need to find out which version of SCO Unix the system is running, older versions (5.0.5, 5.0.6) used Netscape FastTrack (and NCSA) but more recent versions (5.0.7, 6.0)came with Apache (though NCSA is still there too). So far as I know, really old versions didn't have a webserver.
Use this command to find out the Unix version.
This command (as root) may help you find which versions of web-servers are running and where there configuration files are located.
ps -ef | grep httpd
As a last resort you could run this command, which will take a long time.
find / -name httpd.conf
Once you have found the web-server configuration files, you probably want to look for the section that deals with the URLs for the application (perhaps a CGI directory?) - this will tell you which directories to look in to start tracing the application.
In general, pulling data off an undocumented system with an unfamiliar operating system and an unknown DBMS is likely to be difficult. It's not the sort of job I would take on with any confidence.