Incorporating a classifieds section into my Wordpress website.

Hi! I have an Wordpress automotive blog and I'm looking to incorporate a classifieds section into it to show cars for sale in Australia. My original website is autosleek.com.au. I've created a rough idea of what I want on a wordpress subdomain, listings.autosleek.com.au. The theme on the subdomain is called Listify, and it uses WP Jobs Manager and WooCommerce themes to function. Basically, I want you to incorporate the functionality and styling of this subdomain into my main Wordpress website, whilst not breaking my main site. It needs to look visually similar to the mockups I have attached, and must also be mobile friendly (which both sites are already, so any new code added to my original site must look fine on mobile devices). For someone experienced in the Wordpress back-end, this should be a simple matter of copying code from [login to view URL] into autosleek.com.au. The search boxes and listing results page should be similar. The vast majority of the code will I think be in the WP Jobs Manager plugin, so it should be mostly a case of editing the CSS code to ensure the styling is similar to the mockup images I have attached. The winning bidder needs to demonstrate they generally understand what I want done. I don't need the website copied exactly, just the most important aspects (which I will outline in more detail). I will of course provide a more detailed explanation to the winner of exactly what I want done. Please don't hesitate to ask questions if anything is unclear.