Custom Logon Page

Hello,

I am working on creating custom (new html) logon page for Portal 7.4 than use the standard sap delivered (Fiori Landscape is our user homepage).

I am following this blog to customize.

Customizing Logon Page on Portal 7.3

I am thinking of writing simple html page than use sap logonPage.jsp, Is it right / advisable approach to customize portal logon page?

Where would i able to find Submit Button Action - Validations and Navigation?

Please help.

Thanks,

Sri