Create the block itself

src/main/java/systems/brn/server_storage/ServerStorage.java

@@ -0,0 +1,22 @@
+package systems.brn.server_storage;
+
+import eu.pb4.polymer.resourcepack.api.PolymerResourcePackUtils;
+import net.fabricmc.api.ModInitializer;
+import systems.brn.server_storage.blocks.StorageBlock;
+
+public class ServerStorage implements ModInitializer {
+    public static final String MODID = "serverstorage";
+    public static final String MODELID = "storage";
+
+    @Override
+    public void onInitialize()
+    {
+
+        PolymerResourcePackUtils.addModAssets(MODID);
+        PolymerResourcePackUtils.markAsRequired();
+
+        StorageBlock.register();
+
+    }
+    public static StorageBlock JUMP_VADER_BLOCK;
+}

src/main/java/systems/brn/server_storage/blocks/StorageBlock.java

@@ -0,0 +1,39 @@
+package systems.brn.server_storage.blocks;
+
+import eu.pb4.polymer.blocks.api.BlockModelType;
+import eu.pb4.polymer.blocks.api.PolymerBlockModel;
+import eu.pb4.polymer.blocks.api.PolymerBlockResourceUtils;
+import eu.pb4.polymer.blocks.api.PolymerTexturedBlock;
+import net.minecraft.block.AbstractBlock;
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.item.Item;
+import net.minecraft.registry.Registries;
+import net.minecraft.registry.Registry;
+import net.minecraft.util.Identifier;
+import systems.brn.server_storage.ServerStorage;
+import systems.brn.server_storage.items.StorageBlockItem;
+
+public class StorageBlock extends Block implements PolymerTexturedBlock {
+
+    private final BlockState polymerBlockState;
+
+    public StorageBlock(Settings settings, BlockModelType type, String modelId) {
+        super(settings);
+        this.polymerBlockState = PolymerBlockResourceUtils.requestBlock(type, PolymerBlockModel.of(new Identifier(ServerStorage.MODID, modelId)));
+    }
+
+    @Override
+    public BlockState getPolymerBlockState(BlockState state) {
+        return this.polymerBlockState;
+    }
+
+    public static void register() {
+        var modId = new Identifier(ServerStorage.MODID, ServerStorage.MODELID);
+        var block = Registry.register(Registries.BLOCK, modId,
+                new StorageBlock(AbstractBlock.Settings.copy(Blocks.WHITE_WOOL), BlockModelType.FULL_BLOCK, ServerStorage.MODELID));
+
+        Registry.register(Registries.ITEM, modId, new StorageBlockItem(new Item.Settings(), block, ServerStorage.MODELID));
+    }
+}

src/main/java/systems/brn/server_storage/items/StorageBlockItem.java

@@ -0,0 +1,33 @@
+package systems.brn.server_storage.items;
+
+import eu.pb4.polymer.core.api.item.PolymerItem;
+import eu.pb4.polymer.resourcepack.api.PolymerModelData;
+import eu.pb4.polymer.resourcepack.api.PolymerResourcePackUtils;
+import net.minecraft.block.Block;
+import net.minecraft.item.BlockItem;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.util.Identifier;
+import org.jetbrains.annotations.Nullable;
+import systems.brn.server_storage.ServerStorage;
+
+public class StorageBlockItem extends BlockItem implements PolymerItem {
+    private final PolymerModelData polymerModel;
+
+    public StorageBlockItem(Settings settings, Block block, String modelId) {
+        super(block, settings);
+        this.polymerModel = PolymerResourcePackUtils.requestModel(Items.BARRIER, new Identifier(ServerStorage.MODID, modelId));
+    }
+
+    @Override
+    public Item getPolymerItem(ItemStack itemStack, @Nullable ServerPlayerEntity player) {
+        return this.polymerModel.item();
+    }
+
+    @Override
+    public int getPolymerCustomModelData(ItemStack itemStack, @Nullable ServerPlayerEntity player) {
+        return this.polymerModel.value();
+    }
+}