Fatman,drop me a PM or meet me in the chatroom sometime(I'm often there between 9-11:30PM Eastern time.It really is not to complicated,another thing thats great about not buying a fixture is that you have the individual lighting components.If you ever decide to upgrade to a larger or smaller tank,your all set.
BTW,I'm pretty sure there are some online retailers that sell an IceCap660 T5 retro(retro comes with all the components)