Write a little software to our screen/tablet

Hi everyone! :-) We are working on a little project, where we got a tablet - [login to view URL] We want all the orginal software to be removed from the tablet and be replaced with the new software. Our software should be a really simple software and contain the following features: - The tablet should contain a few soundfiles. - A kind of scoreboard/leaderboard with 3-4 rows with names and time - [login to view URL] - We wish the tablet and software to be connect to a BUZZ button and laptimer - when the button has been hit the laptimer should start (all laptimers at the same time) and a little sound with counting sound and startshot, when the startshot have been shot the time begin. The sound should be connected thought wireless speakers around the place. - When the BUZZ button have been hit again at the end, all the informaions (place, starting point and time) should be shown on the tablet - [login to view URL] SPECIFIKATIONS ON TABLET: Light weight only 1.1 kg. Extremely robust design Efficient Intel Atom 1.6 GHz processor 2 batteries with hot-swap (change the battery without loss of data) Sunlight readable touch screen Integrated GPS, WLAN and Bluetooth Waterproof USB and serial port Meets MIL-STD 810G and IP65 standards Operating temperature -23 ° C to 60 ° C Option for HSDPA/3G (Gobi 3000) Option for installation in vehicles We are working on a playground so it is very important that it is childfriendly. Thanks :-)