My scheme for the move will be as follows.
Definition of 2 additional DNS servers.
I will setup those machines to be the masters of all zones.
You can leave all DNS servers in your references at your domain name registrars.
When I make the switchover, I'll install the NEW zonefiles and -HUP the DNS servers let the changes propagate and shutdown everything on the old side.
disconnect the machines... load them in my car, and set them up shortly after I unload them.
Should be a matter of an hour (I hope), provided I don't have an y car problems... (I won't say the problem I am worried most about)
I now have 64 addresses to use vs 32. Wonderba.
I'll post more instructions later, within the next day or so.
This really has turned out for the better. Must one of those "God Details"[1] my wife keeps talking about.
[1] Please, no need to comment on this particular thing. I know how most people feel and we don't need to re-hash it again, to get the same dish we already have.