Help with a complicated Joomla RS Form

Would you give me a quote to implement the following few complicated form fields in my swap proposal form: Fancy multiselect field, where a logged in user who also has his own listings can select one or several of them--this part is already sort of working and shows the listing title as label and value as listing ID. I need to also select a thubnail image from each of the lsitings selected, and submit the image, listing title, and IDs of all selected listings with the form. Here's wher I am trying to implement this and I can provide the logins for testing and admin: [login to view URL] Here's an example of how I accomplished this years ago, but with a Jsom, if you look at a field Swap for My listing: and enter a valid listing ID (try 5060), it will then be imported via RSS and Jsom and become part of the message HTML: [login to view URL] I need a more visual and modern aproach, ideally when a user selects a listing to be included with the form in the next field perhaps it would visually show what is being selected (listing id, thubnail, title, and price) and then it is included in the email body in a similar format. If Jsom or Javascript is still the way to go, I am fine with those solutions as well (except I still dont know if each lsiting can be accessed through a feed, I know all of them can be viewed in a feed), prthaps a preview step, where the entire form is shown before submission--that would actually be ideal. I can provide php code of the listing page that has all the variables and how to get the other values for listing thubnails, and price. etc. Pleae let me know the cost and time frame as I am also need this done farly quickly. Thank you.