It's not like that Paddy, the changes for the bikes and the changes to MB are two separate matters.
Works on the Garage-Vert corner:Major work to the corner on the Bugatti track in order to accomodate the safety requirements of the FIM.
Changes to the entrance of the corner, widening of the track, about 750 m track will "move" slightly to the east, astroturf and a large gravel trap will be installed.
Furthermore there will be a project east of the Bugatti tack, where a new entrance will be made with direct access for people coming from the "tramway" and for handicapped.
A new tunnel and a temporary grandstand for 2000 spectators will be build.
Work on Maison Blanche:They will improve the now existing track on MB so that multiple configurations will be possible, new guardrails will be installed, 4 permanent pitboxes and some gravel traps.
The objective of all this is to use the MB track complimentary to the Bugatti track and has mainly to do with the diversification of the ACO's activities such as drivers training and various club activities.
Just a quick translation (where's kpy when you need him

)
The first part and the Motor safety changes have NOTHING to do with MB.
The ACO are just planning to make better use of the Maison Blanche track (which in a way makes sense).
Surely this will cost (a lot) of campingspace at MB but it's nothing like your drawing above.