I've added constrution details for a new project. It's a digital thermometer that supports two sensors (one indoors and one outdoors perhaps), and also has a real-time-clock built in. Display is via four 2" seven segment displays. The source code is supplied and can be modified and re-compiled with a free compiler. All construction details, PCB foils, .HEX files, source code is supplied in a single downloadable .ZIP file.
It also makes use of the free AMICUS18 PIC compiler and IDE which means that the constructor can customise the firmware for their own specific requirements.
Enjoy.