Add a listing type to phpProBid - New listing format!

I would like an additional listing format created in phpProBid v6.03. It will be similar to the 'Buy Out' listing type, with a modification on the confirmation page. It will also need to be made available to selected users and not made available site wide. We already have a custom 'Raffle' system built in and wouldn't want it to affect that in any way. If this project goes well, we would like more work to be done on other areas of phpProBid. Optional - Depending on price. I would like to integrate a random question generator whereby if answered correctly the user successfully purchases an item. If the user answers incorrectly, the payment still gets made, but the user hasn't purchased the item. The random question integration is the main functionality for a prize competition. The money is simply the entry fee. PLEASE NOTE:::: I am not too sure on how much this would cost, so please e-mail me with your quotes and questions.