@Komisari:
Knowing high quality projects take their time always (everything else would lead to poor output, insecurity or compatibility problems) I highly honor your work, dude!!!
But please do not try to overdo it. Your Trello roadmap shows there would be still much work left. From my experience (writing various little apps, installers and patches or continue work from others) I can tell, loosing focus can happen really fast and time flys by so quick at some point. Sometimes it took me weeks or even months for a little app/patch to finish in my spare time. But there were others I had never finished because of that. What I trying to say is: When working so long on this, there is a not so little risk for you to waking up someday being completely disillusioned and unwilling to continue HHG - and that would be the worst case, probably far more for yourself than for the most of us it could be. Don't try to mess with the biggest software industries with hundreds of full-time payed developers.
We'd be probably all fine by some of HHG graphics/animations or story parts lacks of the upper-most fine details for the sake of you not becoming tired of your most important project. Better skip some minor parts for real and focus on the m later if you feel like it.
All have a nice day!