Measure the actual sheet thickness

The nominal thickness printed on a sheet is a product label. Measure the sheet you will use and enter that actual number.

Try it on a complete plan

For the 400 × 250 × 100 mm tray, 12 mm stock gives a 376 × 226 mm base. At 11.5 mm, the base becomes 377 × 227 mm; side walls become 227 mm. Outside dimensions stay the same.

Before making

Dry-fit the parts, confirm your actual measurements and follow the instructions supplied with your tools, materials and adhesive. These plans cover simple glued desktop organizers with rectangular parts.