as my new roof goes on...

Do I put any screws in it?  I think the answer is no...  But I watched several of mobiltec's videos, but am having a hard time remembering all of the specifics.  So I thought I'd get it in writing.

Here is what I *think* I do...  We attach the roof to the front of the trailer with a rail that Steve (Hemet Valley) provided with the roof.  He said this isn't traditional in old travel trailers, but that it's a good way to do it.  We do screw that down to a 1x4 with putty (and it goes on top of the metal).  Then when we pull the roof sides over to where the j-rail is going to be, and we staple those in on the sides under where the j-rail will be.  

Then I pull the roof down over the back (we are replacing the back, too).  We have pittsburgh locks, so we staple the underside of those to the wood.  We put the pittsburgh locks together (no need for putty tape).  But do I put screws in with the staples on the underside of the pittsburgh locks?

Okay, then we take the bottom of the metal to the underside of the trailer and wrap it around about 1 inch.  We can screw and staple that in (on the underside).  

Then we put the j-rail on and screw that in.

Okay...  So is this right?  Should there be any screws anywhere else?  

Thanks in advance!