Just for a test, I copied default.aspx from STS and renamed to people.aspx, opened ONET.XML and saw 4 entries for default.aspx.
I created same nodes for people.aspx page, did an iisreset, the page crashed and gave 404, page not found error.
This is the url :
http://domainname.com/sites/default.aspx and I ran
http://domainname.com/sites/people.aspx ( crashed)
Which node do I need to create for people.aspx. Is it Modules, Module or File. If possible can you attach a sample ONET.XML file.