Use page entry nodes as custom error pages?

Hello all...

I'm finally jumping on the Drupal train, but I've got a lot of learning to do. I'm very new to Drupal, but i'm very impressed with what I've seen so far. I've been designing ZenCart sites before, but Drupal feels much more intuitive and friendly so far.

I have a two part question...

1) Is there any reason to *not* create a simple page entry node for each error page rather than designing static html pages? (As covered here: http://drupal.org/node/15366) I'd rather have pages that follow the theme automatically. I understand that the error pages wouldn't function when drupal is in offline mode, but that's ok.

2) Is it possible to force nodes to have a specific node number? I know it's probably ridiculously picky, but i'd like error 403 to be node 403, etc. Even if it means starting the 'real' nodes at 1000, etc.

Along the same lines, is it possible to force a specific node numbering scheme? For example, i'd like to choose a scheme like 'YEARMMDD###' so that 9th node created on April 9, 2008 would be 20080409008. Hope that makes sense.