I've successfully edited the CSS, but attempting to add a whole library is going to cause trouble. Not recommended. As far as adding drag and drop capabilities, that's unlikely to happen unless you develop the theme yourself as it requires a fundamental rework.

Thank you @Faiz! I appreciate your quick response

Would it be possible to add available items to room bookings? For example, offering a bottle of wine, extra towels, another bed, or other amenities for a fee.

Removing the code block has allowed me to access the page, with errors. This has allowed me to advance to the point where I am able to add a room type, but I can not complete the room creation because adding anything to the configuration tab results in a modal displaying error:

Unknown error on line 2151 in file /classes/Tools.php
[8192] Function create_function() is deprecated

the line in question in tools.php reads:

return preg_replace_callback('/_+([a-z])/', create_function('$c', 'return strtoupper($c[1]);'), $str);

@shreesh, thank you for your reply.
I've just downloaded and installed it fresh, so I'm using the latest version, 1.4.1. This code block is where the error lies, with the specific error being the second line of this snippet.

        foreach ($attributes as $attribute) {
            $combinations[$attribute['id_product_attribute']]['id_product_attribute'] = $attribute['id_product_attribute'];
            if (!isset($combinations[$attribute['id_product_attribute']]['attributes'])) {
                $combinations[$attribute['id_product_attribute']]['attributes'] = '';
            }
            $combinations[$attribute['id_product_attribute']]['attributes'] .= $attribute['attribute_name'].' - ';

            $combinations[$attribute['id_product_attribute']]['price'] = Tools::displayPrice(
                Tools::convertPrice(
                    Product::getPriceStatic((int)$obj->id, false, $attribute['id_product_attribute']),
                    $this->context->currency
                ), $this->context->currency
            );
        }

Ahh, I forgot I was unable to figure out how to install mcrypt on my commercial webhost. Is there a guide to doing this? Specifically I'm hosted with namecheap.com

Thank you. The error output is as follows:

Warning: Use of undefined constant _RIJNDAEL_KEY_ - assumed '_RIJNDAEL_KEY_' (this will throw an Error in a future version of PHP) in /home/hearqyad/public_html/reservations/classes/Cookie.php on line 79

Warning: Use of undefined constant _RIJNDAEL_IV_ - assumed '_RIJNDAEL_IV_' (this will throw an Error in a future version of PHP) in /home/hearqyad/public_html/reservations/classes/Cookie.php on line 79

Warning: Use of undefined constant MCRYPT_RIJNDAEL_128 - assumed 'MCRYPT_RIJNDAEL_128' (this will throw an Error in a future version of PHP) in /home/hearqyad/public_html/reservations/classes/Rijndael.php on line 124

Warning: openssl_decrypt(): IV passed is only 7 bytes long, cipher expects an IV of precisely 16 bytes, padding with \0 in /home/hearqyad/public_html/reservations/classes/Rijndael.php on line 91

Parse error: syntax error, unexpected end of file in /home/hearqyad/public_html/reservations/controllers/admin/AdminProductsController.php on line 3735

I've just completed my first installation of Qlo and have added a hotel. Now I'm trying to add rooms to that hotel, but navigating to Catalog or Manage Room Type lands on blank page. The html reveals a pairs of HTML, head, and body tags, but nothing more. The network tab reveals that I'm getting a 500 from the web server on these pages. Unsure how to repair this, as this install is only a few minutes old. I am a web developer, so please feel free to talk nerdy to me.