You have a boat built out of aluminium.
Cut using metric dimensions, then finished by someone who works in feet and inches.
Old school just like me.
So what do you think the majority of the internal dimensions are?
You’d think just that, feet and inches, only you’d be wrong.
Cupboards are a sweet little 33 inches wide and 14 inches height, 5 inches deep. nice eh?
No problem there.
Only the distance between them is EXACTLY 100 cm (39.37 inches).
The height from the deck, 150 cm (59 inches)
OK, I can live with that only the waste pipework is 30 mm (1.18 inches) diameter.
The sink? That has a 7/8″ (22 mm) drain hole.
Taps? 1/2 inch (12.7 mm) , but the water pipe going to them is 15 mm (.59 inches).
There are adapters EVERYWHERE!
Windows, 33 inches wide (832 mm), but 900 mm high, (35.43 inches).
The glass? 4mm toughened which could be 5/32 (only it isn’t).
Lights are all 50 mm LED’s but 14 inches apart (355.6 mm) and 60 cm (23.6 inches) from the bulkheads.
As for what screws were used? Forget it.
Stainless steel both imperial and metric.
As for wood?
9 mm , 10 mm , 15 mm ply abound.
Frames though are 1/2 inch, 1 1/4 inch, 2 inches pine or hardwood.
EXCEPT the kitchen where all frames are 40 mm, doors 900 mm, drawers 500 mm.
Skinned by 5/8 beech (15.875 mm).
BUT THE COOKER?
That’s exactly 20 inches across and needs to be fitted into a 500 mm (19.685 inch) base unit!!
I spend half my time looking at my book of tables to convert from metric to imperial and back again.