Regressive Cronometer with interval configurable with atmega / arduino

Budget : 20$ Atention, after working, need project in C++ to arduino and code HEX in my hand. I am intusiast and after i will try change things to improve i want too learn ! I use progisp to record in board. My Board not is arduino, have base in atmega 168 pa, but all board is brother arduino. Draw circuit and requiriments are in files atachement.. Abstract: Cronometer regressive with interval configurable. Cronometer with 5 options, and some other setting ( interval power on, beep, led on, led off ) i am front pc 90% time, contact easy in skype and zap and email. My board are working 100% good, but with other project different, pcb very good. Display multplexing. Board 4 push button, 2 display catode, 2 leds, 2 relay, 1 enter analogic ( improve future ). 2 display 7 segments 3 digits abstract service in file txt and jpge image Only to specialist in arduino or c++ If techinic take my project hard, i think end in 2 hours. If have arduino 168pa, and 4 buttons, led to mount squematic in protoboard, is very good, if can send me it will go in big work.