Maia Sanders: The accomodations for Pilots come in three quality levels and three occupancy rates. Basic, Standard and Lavish for quality, and Individual, Paired and Team.
The better the quality, the less issues the occupant will have with its standard of living. The more people per Quarters, the less privacy they have, and teens are especially big on that. Inadequate privacy or quality afforded by the Quarters assigned to the upcoming Pilots will negatively affect their happiness, ability to improve their skills or even their operational abilities. A Pilot living in Basic Quarters probably won't complain if they live there alone; on the other end, a Team stationed in Lavish Quarters which come equipped with useful appliances and varied modern comforts will probably get along just fine. Place too many of them in low quality rooms, and they will have trouble concentrating on their tasks, get on each other nerves and even submit resignation from the SMC, if worst comes to pass.
As for expansion spaces, it is only a flavorful description by Starlight Architecture Bureau. As I stated before, Base Sites can and will be expanded as needed. Of course, building actual facilities will take both time and thousands of Links.
Base Facilities come in four distinct types: Quarters, which I explained before, Vehicle Storage, which I also briefly explained, Healthcare facilities and Training Facilities. Healthcare Facilities are used for treat Pilots that, due to damage or destruction of their Mechas were Wounded or, even worse, Incapacitated, which will require medical attention and perhaps being taken off active roster until the Pilot is fully healed. Psychiatric counselling is also in this category as grotesque designs of the Mu along with bloodshed and carnage will negatively affect the Pilots. Training Facilities allow a Pilot, or multiple ones, to enter regularly scheduled, prolonged sessions to hone their skills and maximize their potential.