Ok, it looks like your worker.properties and httpd.conf files are clean, with a small exception being the "worker.list" parameter in worker.properties. According to the mod_jk2
doc, "worker.list" is a comma delimited list and yours is space delimited. I haven't found a mod_jk document to confirm this so I can't confirm if the comma delimiter applies to mod_jk as well.
More importantly, the 404 messages are coming from Tomcat, which is good since it means you're reaching it ok.
I'm thinking you don't have the Context
for your web app setup correctly. If you can, post your server.xml file or make sure your Context contains the correct docBase.
I'm surprised that wasn't mentioned in the Tomcat mailing list.