309112 Smarty Shopping Cart Edit

I need an expert with smarty and classes and very complex script structures to start immediately and complete this small project within the next 2-3 hours. I only pay through Escrow. I have added 3 fields and they work and display and i can admin them through my backend just fine. They show on the site just fine. login test1/test1 user/pass [login to view URL] click a category ..and you see down_payment length_of_payments and monthly_payment_amount field data being displayed in bold. click on the product and another page also shows the data ..the single product page ... i need these 3 fields to be passed through the shopping cart process..and be shown on the first popup page and the last page...once when u click My shopping cart or add to cart the cart popsup ....then the next screen is shipping dont need it...then the final page is actual checkout where its needed again and all the math has to work. So at the last page it shows the following under the products XXXX goes to your Outstanding Balance Down Payment -- XXXXXX Shipping (UPS) -XXXXX Tax -- XXXXX Total = down payment + shipping + tax -(the only math you have to make work) needs to send the proper total..