I just had to register to comment on this one.
Wow, that struck a chord. Pretty much every sentence rings true, especially the peer encouragement one. For me it's the availability of easier entertainment - why write that python bookmark creation date histogram plotter, when I'm tired and can just waste the evening reading Reddit? Oh, and there's the procrastination habit I've been nursing for over a decade.
On the other hand, having someone as a sounding board to bounce ideas off, and additionally to guard me from going off tangents and getting distracted - that helps make some progress.
Have you scouted around for a local hackerspace (http://hackerspaces.org/wiki/List_of_Hacker_Spaces)? I did, but I'm using the language barrier (expat) and some leftover social anxiety as excuses to not pursue that road.
All else aside, would you be interested in starting a sort of a study group - just a place one can post their ideas and have others provide brainstorming, feedback and motivation?
I think that may work - I remember my most productive streaks were when a friend had an issue to solve and I would swoop in on the opportunity to help. When faced with a similar issue of my own, I would endlessly procrastinate and often fail. If others have also experienced similar situations, creating such a space to facilitate pair programming could increase everyone's productivity.