Here, some suggestions.
- Chests. Unlike hoppers chests’ capacity don’t correspond to used materials. Some larger chests would be nice considering number of ore byproducts.
- Shutter cover for burning boxes. Vanilla pistons are deprecated.
Manual variant for early game smth like: bricks + plate + rod.
Automatic for late: aluminium cover, plate, two rods (guide rails), compact electric piston.
- Dump pipe cover, opposite of drain. Working only in rivers, polluting water with sluice juice