Thanks everyone for kind words and support
Here are the news.
I have started a day with mocking up the bike.
And surely checking the chain line! It is all good, there is a little bit of contact sometimes between the chain and the inner side of the chain stay, but it could be fixed by flipping the sprocket, and so i am going to do.
Then i have made a coaster brake tab. I have chosen not very thick, about 3mm, but very hard steel. Honestly by the evening i have started doubting that decision, maybe i should have taken 5mm in the end. Anyway, i believe this should be strong enough.
And that is going to become my seat pan!
Here i am sketching a reinforcement plate for the place where cantilevers meet the top tube.
And here after an hour of grinding and welding there is the same plate out of 5mm steel.
These objects are: two steel plates, two m10 nuts and one bolt and a piece of 15mm tube i used for cantilevers.
And now they become a hinge for the seat!
The plate is welded in place.
Same goes for coaster tab.
Checking the position of the seat.
Guess what this is:
Two m10 bolts are welded on at an angle.
Now here how that part looks when done:
And here it is assembled. I used some bobber-style solo seat springs that i have ordered some time ago from local motorcycle parts website. All the plates are bolted on the board with its original bolts.
At this point the day was coming to end and i had just about an hour to finish my work and clean up the workshop, so i forgot to take some process pictures. But the frame mount for those springs is made in the same way.
Here i am cutting the hole in existing washers, because i ran out of the size i need and had no time to buy new ones
And here we go! By the end of the day i have the bike practically done. I even had time to clean up after myself
Still i am thinking of maybe remaking a coaster tab and adding the kickstand mount to fill the space between the chain stays after the wheel in future.
I love the looks of those bars and KK front end here!
One last thing i have done before leaving is cutting the board.
Still the shape has to be altered even further, it is very uncomfortable to ride while touching the corners of the board with your shin.
And here is a first ride! YAY! Still can't believe i have done it in such a short (for me) term!
When back to the garage, the first thing i have done is installing the shifter. Since this build has this kind of raw ratty vibe, i have decided to put on old Centrix shifter i have got at swapmeet at CSI last year!
Even though it has more travel then nexus shifter it kind of works okay. And i have used an old baking cable for shifting! Braking the rules!
One other thing i have done is adding extra nuts on the frame mounts to put a seat a little higher.
And this is it for now. In my last days before leaving i might change some other details, but i guess the bike is more or less done at the moment. Painting and other details and adjustments i am going to do after i come back in august.
Oh yea, and did i tell you it is an awesome ride? Could not convince myself to leave it at the garage yesterday!