Regluing back complete transom is a tedious and complex work, will need to remove old glue from tubes and both sides of transom holder with special solvents like Mek, mix 2 part PVC or Hypalon glue depending on fabric used, glue under control temp conditions. It's a skilled work, if wanting immaculate re gluing send sib to inflatable shop that knows their work well, it's a costly job, but transom along engine are the soul of the cool party...
Being a 12 year oldie probably ungluing external parts as handles, oar holders, lower deck fabric, etc could follow...
Happy Boating
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