Write Component based on Event Booking (Joomla 3)

What I want: ============== I want each partner to able to Submit Events (via event booking joomla component) but each event must include hotels + type of rooms + extra services (breakfast etc). Also I want advanced search with all available fields. Each client will make a reservation and on orderform can choose hotel/room types/services and price will be updated on cart. Note: I will provide you the eventbooking component+modules (J3.4.5) Technical ============== I would like to create a component that extends the Event Booking, I don't want to edit the core files of Event Booking to able to update on future. So the new component will use the core files of Event Booking. It will adds 3 new fields in form (related each other) 1) Select Multiple Hotels (from predefined List administrator) Example: Hotel_1, Hotel_2 2) Add Room types (from predefined List administrator) + availability EXAMPLE: Hotel_1: -Double Room 10 available, Triple Room: 20, Single Room:15 Hotel_2: -Double Room 5 available, Triple Room: 15, Single Room:20 3) Select Multiple Services foreach Hotel, AttributeName+Price Example: Hotel_1 -Breakfeast 5 Euro -Spa 10 Euro etc Hotel_2 -Breakfeast 0 Euro -Spa 5 Euro etc Note: Each hotel/roomtype/Service it will be assigned to each event. Check database stucture. 4) Clients will search for events by all standard fields of Event Booking plus: Hotels,by Services, by event date (+- 3 days), by month, by current week (most are available via Event Booking) 5) Advanced Search module. It will display the basic form with "Advanced Fildter option" that it will display more filters 6) Each client will make a reservation and on orderform can choose hotel/room types and total order will change based on charges and if order status is confirmed the room availability will decrease until goes 0, if goes zero it will be hidden from clients Total Cost = EventAmount+HotelCost+RoomCost+Servicecost Component Administrator ======================================= List of Hotels/ Add-Edit Hotels List of Room types/ Add-Edit Room types List of Services/ Add-Edit Services Note: I know exactly how it can be done techinaly because I'm joomla programmer too but I'm very busy and project must be ready as soon as possible! (max 8 days)