Even using this document (which is specifically for 220.127.116.11.0) notice that the extent of the WebTier configuration is "8. Configure Oracle HTTP Server on APPHOST1."
What do you want to do? If you can see the HTTP Server in EM then you should be able to configure it via EM?
There is no Instance_Home. So how is that supposed to be configured? There isn't even an instance folder under ORACLE_HOME.
By default the instance_home isn't under oracle_home but parallel to it right under middleware_home. The default name is asinst_1 if memory serves.
You did create a weblogic domain after (or during) the installation of forms&reports, didn't you?
I've configured OHS for the rest of our environment so that it runs on it's own servers completely seperate from the other applications.. Now I want to try installing it on the same server as the Forms and Reports application. It just doesn't make any sense though... I'm about to scrap the whole install, reinstall just the Forms & Reports, and then install the WebTier portion on top of it with the stand-alone WebTier download..
would you care to elaborate a little bit more what exactly you installed including 5 digit version numbers and platforms of the product you installed, as right now I have no idea what you did or want to do.