Possible Clues:

• Working inside narrow part of vessel, a boy builder
• Artisan builder
• Initial signature sound by two family members and one of The Quarrymen perhaps
• One working with, eg, granite
• Mum entertained by Jagger et al performing — one getting into rock?
• Builder so set on man getting sacked
• Craftsperson one mum and lad spotted at side of street
• Craftsman means to groom his boy
• Man soon set to build -- builder!
• Rough notes man has penned like that for builder