I added MPGUINO13 eagle files to the repository, though a couple things to note:
It is not compatible with the working but deprecated arduino pde. The original MPGUINO files and schematic should be though. Arduino is a great learning platform, but I had really pushed it beyond arduinos meta-limits here and it wasn't sustainable (hence the arduino version 0011 dependency)
It is only compatible with mpguino.cpp version .83 and above (just released .86 with metric display option which needs an atmega328 for space), so you will need to sort out making hex file and isp programming.
It is not single sided, turns out that none of the board houses offer any price break for single v/s double sided so I lost interest in maintaining the extra complicated one-sided layout. If you just need one, I suggest other prototype construction methods, i.e. what is in
post 15
