As you implement new buildables and items, consider adding higher quality versions of the planks/thatch/metal scrap. Say, 5 or 10 of each to make the higher quality version. As it stands now, even with chests, it's easy to fill them depending on your number of item nets. This would help reduce buildup of those base materials, and provide for higher level crafting trees. It's also something that could snowball into better and higher quality materials. OR, consider adding things like a furnace or loom where you have to create the higher quality materials.