Hello. I'm MCP Certified professional. I have experience migrating Active Directory, Shares, DHCP/DNS servers. I have experience migrating servers like this and this is pretty easy job for Microsoft experienced specialist like me.
It's all clear about current Active Directory infrastructure and how to migrate it, we will only have to discuss details about website migration.
We can discuss methods of blocking sites like Facebook (because they are using HTTPS and this is not trivial task)
For sure I can give you great future support because I'm full time freelancer, I don't have any other job, only serving my customers on freelancer.
Also we can discuss your Access database and maybe can re write it using PHP+MySQL or something like that.
Thank you and looking for to work with you.