I'd go for 3 people. Although we managed with 2, but the strain was felt...
You could actually take the meter bridge off, but leave it if it's not in your way to much.
Be very careful when reseating the modules,and take your time to test them adding one module at a time. Dont roll up the power cables to tight,they have a tendency to break (well the returns do..)
Good luck!
(Now when we moved the 528..... ouch. (up one flight...)
cheers
Pieter