Did your engine fitter bake bread? Beer and bread have synergy, they have yeast in common.
My 18thC innkeepers in a small, quiet, seaside town were also the town butchers. Neither was a full time occupation. Butchery was seasonal, mainly late autumn to early winter. Wife and children could look after inn when husband was working. This continued for 3 generations. Occupation in parish register was variously innkeeper, butcher, yeoman (inn had land + cottages attached). Return of Papists 1767 has elder man's occupation as innkeeper (he was 67 and died shortly after) and younger man, aged 29 (possibly nephew) as innkeeper & butcher.
When the younger innkeeper & butcher listed in Return of Papists died in 1780 he was innkeeper in burial register. 5 years later his only son married, occupation butcher. Around same time his widowed mother married a maltster. (Synergy again.) She might have run the inn while her son was being a butcher. Then seaside holidays & trips became popular. Coaches arrived at the inn. Business was booming. Fortunately the latest Mrs Innkeeper-Butcher produced a large number of healthy children to help run the inn. Youngest surviving son (my direct ancestor) learned about meat as well as serving customers. After 30+ profitable years, Mr & Mrs Innkeeper gave up their business and lived on investment income. When the youngest son, my ancestor needed to earn money again, he turned to selling meat. Later he did a day job for a wage while his wife looked after the shop. This man had at least 8 occupations in his long life, including most of those followed by his father and 3 of his 4 brothers.