Re: Bryan Singer Directing X-Men: Days of Future Past
If push comes to shove and they can't find a logical way of Xavier and Magneto building Cerebro together, I'd rather they don't force it. It could go the way of "When I was 17, I met a young man called Erik Lensherr..." and all the slight inconsistencies from the other films.
I can't believe I'm suggesting them to take Grant Morrison's lead from New X-men, but with all the slight inconsistencies from the 5 films, they're better off using a loose continuity and worry about making a great movie, first and foremost.
Besides Xavier has other TK-powered mutants in the mansion that would be very useful in building that "big round room." Magneto knowing how to rearrange the plates could be stemmed from the blueprints and whatever else info Mystique got/printed from Lady Deathstrike's computer.