Help code Java model

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public class custom_model<T extends Entity> extends EntityModel<T> {

    // This layer location should be baked with EntityRendererProvider.Context in the entity renderer and passed into this model's constructor

    public static final ModelLayerLocation LAYER_LOCATION = new ModelLayerLocation(new ResourceLocation("modid", "custom_model"), "main");

    private final ModelPart head;

    private final ModelPart body;

    private final ModelPart front_left_leg;

    private final ModelPart front_right_leg;

    private final ModelPart back_left_leg;

    private final ModelPart back_right_leg;

    private final ModelPart tail;

    private final ModelPart tail2;

    public custom_model(ModelPart root) {

        this.head = root.getChild("head");

        this.body = root.getChild("body");

        this.front_left_leg = root.getChild("front_left_leg");

        this.front_right_leg = root.getChild("front_right_leg");

        this.back_left_leg = root.getChild("back_left_leg");

        this.back_right_leg = root.getChild("back_right_leg");

        this.tail = root.getChild("tail");

        this.tail2 = root.getChild("tail2");

    }

    public static LayerDefinition createBodyLayer() {

        MeshDefinition meshdefinition = new MeshDefinition();

        PartDefinition partdefinition = meshdefinition.getRoot();

        PartDefinition head = partdefinition.addOrReplaceChild("head", CubeListBuilder.create().texOffs(0, 0).addBox(-2.5F, -2.0F, -3.0F, 5.0F, 4.0F, 5.0F, new CubeDeformation(0.0F))

        .texOffs(0, 24).addBox(-1.5F, -0.02F, -4.0F, 3.0F, 2.0F, 2.0F, new CubeDeformation(0.0F))

        .texOffs(0, 10).addBox(-2.0F, -3.0F, 0.0F, 1.0F, 1.0F, 2.0F, new CubeDeformation(0.0F))

        .texOffs(6, 10).addBox(1.0F, -3.0F, 0.0F, 1.0F, 1.0F, 2.0F, new CubeDeformation(0.0F)), PartPose.offset(0.0F, 15.0F, -9.0F));

        PartDefinition body = partdefinition.addOrReplaceChild("body", CubeListBuilder.create().texOffs(20, 0).addBox(-2.0F, 3.0F, -8.0F, 4.0F, 16.0F, 6.0F, new CubeDeformation(0.0F)), PartPose.offsetAndRotation(0.0F, 12.0F, -10.0F, 1.5708F, 0.0F, 0.0F));

        PartDefinition front_left_leg = partdefinition.addOrReplaceChild("front_left_leg", CubeListBuilder.create().texOffs(40, 0).addBox(1.2F, 0.0F, 0.0F, 2.0F, 10.0F, 2.0F, new CubeDeformation(0.0F)), PartPose.offset(-1.1F, 14.1F, -5.0F));

        PartDefinition front_right_leg = partdefinition.addOrReplaceChild("front_right_leg", CubeListBuilder.create().texOffs(40, 0).addBox(-3.2F, 0.0F, 0.0F, 2.0F, 10.0F, 2.0F, new CubeDeformation(0.0F)), PartPose.offset(1.1F, 14.1F, -5.0F));

        PartDefinition back_left_leg = partdefinition.addOrReplaceChild("back_left_leg", CubeListBuilder.create().texOffs(8, 13).addBox(1.2F, 0.0F, 1.0F, 2.0F, 6.0F, 2.0F, new CubeDeformation(0.0F)), PartPose.offset(-1.1F, 18.0F, 5.0F));

        PartDefinition back_right_leg = partdefinition.addOrReplaceChild("back_right_leg", CubeListBuilder.create().texOffs(8, 13).addBox(-3.2F, 0.0F, 1.0F, 2.0F, 6.0F, 2.0F, new CubeDeformation(0.0F)), PartPose.offset(1.1F, 18.0F, 5.0F));

        PartDefinition tail = partdefinition.addOrReplaceChild("tail", CubeListBuilder.create().texOffs(0, 15).addBox(-0.5F, 0.0F, 0.0F, 1.0F, 8.0F, 1.0F, new CubeDeformation(0.0F)), PartPose.offsetAndRotation(0.0F, 15.5F, 8.0F, 1.5708F, 0.0F, 0.0F));

        PartDefinition tail2 = partdefinition.addOrReplaceChild("tail2", CubeListBuilder.create().texOffs(4, 15).addBox(-0.5F, 0.0F, 0.0F, 1.0F, 8.0F, 1.0F, new CubeDeformation(0.0F)), PartPose.offsetAndRotation(0.0F, 15.5F, 16.0F, 1.5708F, 0.0F, 0.0F));

        return LayerDefinition.create(meshdefinition, 64, 32);

    }

    @Override

    public void setupAnim(T entity, float limbSwing, float limbSwingAmount, float ageInTicks, float netHeadYaw, float headPitch) {

    }

    @Override

    public void renderToBuffer(PoseStack poseStack, VertexConsumer vertexConsumer, int packedLight, int packedOverlay, float red, float green, float blue, float alpha) {

        head.render(poseStack, vertexConsumer, packedLight, packedOverlay, red, green, blue, alpha);

        body.render(poseStack, vertexConsumer, packedLight, packedOverlay, red, green, blue, alpha);

        front_left_leg.render(poseStack, vertexConsumer, packedLight, packedOverlay, red, green, blue, alpha);

        front_right_leg.render(poseStack, vertexConsumer, packedLight, packedOverlay, red, green, blue, alpha);

        back_left_leg.render(poseStack, vertexConsumer, packedLight, packedOverlay, red, green, blue, alpha);

        back_right_leg.render(poseStack, vertexConsumer, packedLight, packedOverlay, red, green, blue, alpha);

        tail.render(poseStack, vertexConsumer, packedLight, packedOverlay, red, green, blue, alpha);

        tail2.render(poseStack, vertexConsumer, packedLight, packedOverlay, red, green, blue, alpha);

    }

}