That's not building...that's RE-BUILDING...the absolute worst part of building.
If you want him to be a builder, tell him to start with a SIG Somethin' Extra...laser cut, nice easy builder that will build confidence and pride.
Shoot, repairing damage like that might spoil him on building forever.
And then he is left with a Frankenplane...a backup POS that will fly poorly (heavy) and be a source of embarrassment and humiliation.
OK, repair it and use it in Combat....or as a target drone.