diff --git a/src/dux/index.js b/src/dux/index.js
index 204169d..9d83cb5 100644
--- a/src/dux/index.js
+++ b/src/dux/index.js
@@ -118,11 +118,6 @@ dux.addSubscription((store) =>
     (ship) => ship.structure.screens.standard,
     (ship) => ship.structure.screens.advanced,
     (mass, standard, advanced) => {
-      console.log({
-        mass,
-        standard,
-        advanced,
-      });
       const standard_mass = standard * Math.max(3, ceil(0.05 * mass));
       const advanced_mass = advanced * Math.max(4, ceil(0.075 * mass));
 
diff --git a/src/dux/structure/screens/index.js b/src/dux/structure/screens/index.js
deleted file mode 100644
index 73a4a4e..0000000
--- a/src/dux/structure/screens/index.js
+++ /dev/null
@@ -1,18 +0,0 @@
-import Updux from "updux";
-import { action, payload } from "ts-action";
-import u from "@yanick/updeep";
-import { createSelector } from "reselect";
-
-const dux = new Updux({
-    initial: {
-        standard: 0, advanced: 0, cost: 0, mass: 0,
-    }
-});
-
-const set_screens = action('set_screens', payload() );
-dux.addMutation(set_screens, payload => u.update(payload) );
-
-const set_screens_reqs = action('set_screens_reqs', payload() );
-dux.addMutation(set_screens_reqs, payload => u.update(payload) );
-
-export default dux.asDux;
diff --git a/src/lib/components/ShipEdit/Structure/Screens.svelte b/src/lib/components/ShipEdit/Structure/Screens.svelte
new file mode 100644
index 0000000..57aad57
--- /dev/null
+++ b/src/lib/components/ShipEdit/Structure/Screens.svelte
@@ -0,0 +1,37 @@
+<ShipItem {...reqs}>
+  <div>
+    <Field label="screens">
+      <input type="number" bind:value={standard} min="0" />
+    </Field>
+
+    <Field label="advanced screens">
+      <input type="number" bind:value={advanced} min="0" />
+    </Field>
+  </div>
+</ShipItem>
+
+<script>
+  import { getContext } from "svelte";
+
+  import Section from "$lib/components/Section/index.svelte";
+  import Field from "$lib/components/Field/index.svelte";
+  import ShipItem from "$lib/components/ShipItem/index.svelte";
+
+  export let reqs = {};
+  export let standard = 0;
+  export let advanced = 0;
+
+  const ship = getContext('ship');
+
+  $: ship.dispatch.setScreens({ standard, advanced });
+</script>
+
+<style>
+  input {
+    width: 3em;
+  }
+  div {
+    display: flex;
+    gap: 2em;
+  }
+</style>
diff --git a/src/lib/components/ShipEdit/Structure/index.svelte b/src/lib/components/ShipEdit/Structure/index.svelte
index 99699f6..0bfd6bf 100644
--- a/src/lib/components/ShipEdit/Structure/index.svelte
+++ b/src/lib/components/ShipEdit/Structure/index.svelte
@@ -1,14 +1,16 @@
 <Section label="structure">
     <Hull {...hull}/>
+    <Screens {...screens} />
 </Section>
 
 <script>
   import Section from "$lib/components/Section/index.svelte";
   import Hull from './Hull.svelte';
+  import Screens from './Screens.svelte';
 
   export let hull = {};
+  export let screens = {};
 
-  $: console.log(hull);
 
 </script>
 
diff --git a/src/lib/shipDux/index.js b/src/lib/shipDux/index.js
index c3b1c69..4b74aab 100644
--- a/src/lib/shipDux/index.js
+++ b/src/lib/shipDux/index.js
@@ -6,6 +6,7 @@ import identification from "./identification.js";
 import { calculateDriveReqs } from './propulsion/drive.js';
 import { ftlReqsReaction } from './propulsion/ftl.js';
 import structure from './structure/index.js';
+import { screenReqsReaction, screensReqsReaction } from './structure/screens.js'
 
 const dux = new Updux({
   subduxes: {
@@ -24,5 +25,6 @@ dux.setMutation( 'setShipMass', mass => u({reqs: {mass}}) );
 
 dux.addReaction( calculateDriveReqs );
 dux.addReaction( ftlReqsReaction );
+dux.addReaction( screenReqsReaction );
 
 export default dux;
diff --git a/src/lib/shipDux/structure/index.js b/src/lib/shipDux/structure/index.js
index e407a17..a2f8b4d 100644
--- a/src/lib/shipDux/structure/index.js
+++ b/src/lib/shipDux/structure/index.js
@@ -1,8 +1,9 @@
 import { Updux } from 'updux';
 
 import hull from './hull.js';
+import screens from './screens.js';
 
 const dux = new Updux({
-    subduxes: { hull }
+    subduxes: { hull, screens }
 });
 export default dux;
diff --git a/src/lib/shipDux/structure/screens.js b/src/lib/shipDux/structure/screens.js
new file mode 100644
index 0000000..49e3ed4
--- /dev/null
+++ b/src/lib/shipDux/structure/screens.js
@@ -0,0 +1,40 @@
+import { Updux } from "updux";
+import u from 'updeep';
+import { createSelector } from 'reselect';
+
+import reqs from '../reqs.js';
+
+const dux = new Updux({
+  subduxes: {
+        reqs
+  },
+  initial: {
+        standard: 0, advanced: 0,
+  },
+  actions: {
+        setScreens: null,
+        setScreensReqs: null,
+  }
+});
+export default dux;
+
+dux.setMutation('setScreens', payload => u(payload));
+dux.setMutation('setScreensReqs', reqs => u({reqs}));
+
+export const screenReqsReaction = store => createSelector(
+    (ship) => ship.reqs.mass,
+    (ship) => ship.structure.screens.standard,
+    (ship) => ship.structure.screens.advanced,
+    (...args) => store.dispatch.setScreensReqs(calcScreensReqs(...args)),
+);
+
+function calcScreensReqs(mass,standard,advanced) {
+
+    const standard_mass = standard * Math.max(3, Math.ceil(0.05 * mass));
+    const advanced_mass = advanced * Math.max(4, Math.ceil(0.075 * mass));
+
+    return {
+          mass: standard_mass + advanced_mass,
+          cost: 3 * standard_mass + 4 * advanced_mass,
+    }
+}