Please don't waste my time by just only bidding.
Attached is an FRD that has the requirements and we might have a changes during the development so you need to encounter a risk of additional efforts that might be needed. Code re-use is important. Our modules are straight forward and have been developed more then million times so no development from scratch. You should be able to build on the top of what you have and optimize your efforts.
UI UI UI UI is important. Please read the FRD - don't bid unless you read and understand. Make sure the timeline is accurate.