is it possible build by yourself Arduinoi YUN?

hello....is it possible build by yourself Arduino YUN?....anyone know if exist any 'particoular' machine or procedure tha allow to reproduce this platform? thanks

ok i think that maybe this is a good solution....

and....which is your opinion about the software module?...and....according to you, there is any problem for software architecture structure (Linino and Bridge + microcontroller)...?