Modify Existing DNN DotNetNuke Modules

I purchased Facility Booking 2.0 from [login to view URL] and later realized that time booking for appointments is only available in 1hour increments on the hour (i.e. 1PM, 12PM, 7AM, etc). I need this module modified so that it shows on the half-hour or 15minute as well. I have the source code so this would be a modification only, not creating from scratch. To see a demo of the module go to the following URL: [login to view URL] I posted this project before, but I did not receive bids from anyone indicating that they have experience with DotNetNuke 4.3.5. If you are bidding, please provide descriptions of type of modules you have worked on in the past.