Flat domain to start off?

Currently we have NT4 domain structure across our sites - 2 main offices and
few small remote offices overseas. Each office location has a different IP
address range such as:

office 1 - 10.1.x.x
office 2 - 10.10.x.x
office 3 - 10.20.x.x

At the present time, it's one flat domain. Can we start off with upgrading
our existing NT4 PDC to AD 2003, keeping the same structure and same domain
name as our existing NT4 domain. Down the road, create sub-domains and
migrate users and computers to these sub domains? One sub-domain can be
like office1.company.com and move all computers/users that belong to office
location 1 to that domain.

One thing I'm concern is we have slow links between oversea offices. At the
present time, these offices have local BDCs but we have to block the traffic
between PDC and BDC, or else it kills the link. Would keeping a flat domain
doable?

Appreciate your comments.



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