1: Set up your custom menu.
2: Set up the essential menu items. (Block Shop, Item Shop, Crafting Bench, Backpack, Home Teleport)
3: What are these menu item scripts? All but the Tele Home are Open Block Scripts. Just place the Chest, Shops, and Crafting Bench where randoms can't reach them, (underground in a no edit zone) and there you go. Just open their coordinates.