1984 Honda C70 E CUB Street Cub Build P12 Tsunami Victim Raw Low Rider: trying to get the piston out

Hello :-)
working on all the problem areas today
a. cluch housing cover plate ball bearing
b. stuck camshaft
c. stuck ignition plate
d. slowly but surely pushing the piston down some more
Further trying to prize off the cylinder.
The cylinder comes off the engine housing, but the crank still refuses to turn,
and the piston stays stuck for now.
Further soaking...
I have updated the mock-up
Basically I am seeing what needs done to achieve the seat height becoming lower than the rear tyre. (This being the central point that defines the look of this build)
So, so far I confirm:
1. Rear tyre as big as see possible
2. Front tyre as small as I see possible
3. Shorten the front fork 40 mm and extend wheelbase via external shock
unit by 40 mm
4. Extend Frame tube at lower end and reposition swing axis from bottom to
top of main frame tube and rearward (height wise this comes out about
the same but moves swing arm axis rearward considerably
5. I will need to section the tank..
6. ..and section the center body in 2 places by about a total of 70 mm in
height
7. Position 6 will then bring the seat height below the rear tyre height
8. In order to position the rear wheel center upwards I will need to extend the
rear swing arm and reposition the upper mounting axis of the rear suspension units