Hello!
I'm an expert in MS Exchange and SFB with 10+ years of hands-on experience, so I'm fully qualified to deliver this project for you.
First of all, a few questions.
1. Will it be the installation from scratch or adding multi-tenant features to an existing installation?
2. Physical servers or virtualized (VMWare/HyperV)?
3. Did you already calculate requirements (CPU, RAM, network, storage iops, message profile) with Exchange calculator?
Hope to work with you, best regards, Evgeny Vovney.