It finally stopped raining. The sun came out nice and bright and I able to find my way to the shop to continue the oak box. There was no need to build an ark after all.
Having already cut out the individual parts, I squared them up and formed the rebates on the front and back pieces.
Then a quick dry fit to check for squareness.
After a bit of tweaking, I formed the pintles on the back piece.
Before calling it a day, I managed to resaw some oak and fit the till bottom and front. Once I fit the till lid, wrought iron nails will secure the carcass.