This is an impressive theme, i love it being simple. i am currently using it to developing personal blogging site http://tripletrio.org.
The issue is i want to replace the header with a slider or increase the height of the header so i can i insert a background header image.
These are custom implementations that requires custom development and are definitely out of scope of free support. My goal here it to help you to use Theme Options and help to setup website which would look like this, with navigation bar, slider, cal for action button etc. Other customizations are up to you.
Why don’t you use regular slider instead of trying to replace it with header?
You can hide nav bar if you like:
nav.navbar.navbar-default {
display: none;
}
The rest is up to you.