I am sorry, but I could not let this lie go past.
You told me you had 40 sites you wanted to move from Webair and you wanted to know how they should be cross-linked. By domain, niche, etc.
That would be a nice trick to do in a 5 minute telephone conversation.
I had already given you the basics:
As far as interlinking is concerned, if I go on the presumption that you have one money site and the rest are feeders for it, you should put the money site on a dedicated IP, by itself, and on a different C than the other sites.
You can then do one way links from the feeders to the money site. You can trade links between your feeder sites, making sure they are relative and they should be on different C's. That is a very general description, but it should give you an idea of how you would want to get started.
If I had seen
this thread I would have told you I was not interested from the gate.