Migrating Support Messages from Maintenance project

We have an implementation project created in 3.2 and we have created messages in project using solar01 txn. we are planning to move to solman 4.0.

Will migrating projects using Solar_migration migrate the messages created under the implementation projects?.

how is Project system landscape migrated ( any impacts using solar_migration) ?.

Can system landscape description ( SMSY) be transported ?.

Please provide any inputs you have...