Finished the Detolf lid today. Luckily I didn't mess up the measurements. I never really took carpentry in school.
Cost was about $5 in wood, few dollars for some window seal for padding to sit on the bars, around $8 in handles if I recall correctly, the mesh was about $11 for a full sheet (with plenty left over) and I had to buy a stapler (about $20 + staples).
Some jagged edges on the mesh. Maybe run some silicone glue over the the jagged ends?