Install.php not found after installing with Drustack
Please see Usage page of drustack-standard project at GitHub:


  
  Drupal will be installed in the web-directory.
  Autoloader is implemented to use the generated composer autoloader in vendor/autoload.php, instead of the one provided by Drupal
  (web/vendor/autoload.php).
  Modules (packages of type drupal-module) will be placed in web/modules/contrib/
  Theme (packages of type drupal-theme) will be placed in web/themes/contrib/
  Profiles (packages of type drupal-profile) will be placed in web/profiles/
  Creates default writable versions of settings.php and services.yml.
  Creates sites/default/files-directory.
  Latest version of drush is installed locally for use at vendor/bin/drush.
  Latest version of DrupalConsole is installed locally for use at vendor/bin/drupal.
  


Therefore setup your web server for DruStack if:


You are running with Apache2, point your DocumentRoot to the web folder
You are running with PHP internal web server, execute php -S 127.0.0.1:8080 -t web


Then access the core/install.php directly to kickstart the installation ;-)