diff --git a/index.html b/index.html
index b0dd66a..626c3c5 100644
--- a/index.html
+++ b/index.html
@@ -9,9 +9,9 @@
 <body>
 <nav id="top-menu" class="menu-bar">
   <div data-section="File" data-alt="f">
-    <button data-alt="n" data-button="file:new">New</button>
-    <button data-alt="o" data-button="file:load">Open</button>
-    <button data-alt="s" data-button="file:save">Save</button>
+    <button data-alt="n" data-button="file:new" disabled data-enable-on="config:end">New</button>
+    <button data-alt="o" data-button="file:load" disabled data-enable-on="config:end">Open</button>
+    <button data-alt="s" data-button="file:save" disabled data-enable-on="config:end">Save</button>
     <div data-section="Configuiration" data-alt="c">
       <button data-alt="d" data-button="load-configuration" data-configuration="default">Default</button>
       <button data-alt="e" data-button="load-configuration" data-configuration="e2ee">E2EE</button>
@@ -57,10 +57,17 @@
   <span data-resize="bottom-menu"></span>
 </aside>
 <main>
-  <div data-state="initialization">
+  <div data-state="initialization" class="m2">
     Select configuration file:
-    <button data-button="load-configuration" data-configuration="default">Default (2026-07-06)</button>
-    <input type="file" data-input="configuration" accept=".ncpf.json" />
+    <div class="m1">
+      <button data-button="load-configuration" data-configuration="default">Default</button>
+    </div>
+    <div class="m1">
+      <button data-button="load-configuration" data-configuration="e2ee">E2EE</button>
+    </div>
+    <div class="m1">
+      <button data-button="load-configuration">Select file...</button>
+    </div>
   </div>
   <div data-state="planning">
     <header class="status-bar">
diff --git a/scripts/files.js b/scripts/files.js
index efd9f00..3b21289 100644
--- a/scripts/files.js
+++ b/scripts/files.js
@@ -1,6 +1,7 @@
 import { awaitEvent, emitEvent, listenTo } from "./events.js";
 import { checkEquivalence, findFullEntry, stripEntryToMinimums } from "./ncpf-utils.js";
 import {
+  clearPlanner,
   getPlannerDom,
   getPlannerMultiblockSize,
   getPlannerMultiblockType,
@@ -14,7 +15,10 @@ import { DevError, UserError } from "./errors.js";
 
 registerLoadCallback(() => {
   listenTo("file:load", () => showOpenFileDialog(({ data, filename }) => loadFile(data, filename)));
-  listenTo("file:new", () => {});
+  listenTo("file:new", () => {
+    clearPlanner();
+    resetSolver();
+  });
   listenTo("file:save", () => saveFile());
 });
 
diff --git a/scripts/main.js b/scripts/main.js
index 77046c2..3444931 100644
--- a/scripts/main.js
+++ b/scripts/main.js
@@ -77,6 +77,12 @@ window.addEventListener("load", () => {
       emitEvent(elem.dataset.form + ":submit", e);
     });
   });
+  getElements("enable-on", "*").forEach(elem => {
+    elem.disabled = true;
+    awaitEvent(elem.dataset.enableOn).then(() => {
+      elem.disabled = false;
+    });
+  });
 
   listenTo("config:end", () => setState(STATE.planning));
 
diff --git a/scripts/planner.js b/scripts/planner.js
index 1a044ba..a3adc18 100644
--- a/scripts/planner.js
+++ b/scripts/planner.js
@@ -12,9 +12,15 @@ const zoomOptions = [ 0.5, 1, 2, 3, 4, 5 ];
 const zoomDefault = 2;
 const zoomStorageKey = "zoom-size";
 
+const defaultMultiblockSize = [9, 7, 9]; // width (screen x), height (xy grids), depth (screen y)
+const defaultMultiblockType = "nuclearcraft:overhaul_sfr";
+const maxMultiblockSize = {
+  ["nuclearcraft:overhaul_sfr"]: [26, 26, 26],
+}
+
 let suppressHover = false;
-let multiblockSize = [9, 7, 9]; // width (screen x), height (xy grids), depth (screen y)
-let multiblockType = "nuclearcraft:overhaul_sfr";
+let multiblockSize = [...defaultMultiblockSize];
+let multiblockType = defaultMultiblockType;
 
 registerLoadCallback(() => {
   listenTo("config:end", buildPlanner);
@@ -257,9 +263,9 @@ export function getSelectedCells() {
   return [...document.querySelectorAll("#planner [data-selected]")];
 }
 
-export function clearPlanner(size, type) {
-  multiblockSize = size;
-  multiblockType = type;
+export function clearPlanner(size = null, type = null) {
+  multiblockSize = size ?? [...defaultMultiblockSize];
+  multiblockType = type ?? defaultMultiblockType;
   buildPlanner();
 }
 export function loadPlanner(size, type, textures) {
