First I had to minimize the heave-work, so I put the second beam on a little higher position next to the fist beam with blocks:
now I could heave one end of the second beam on or off the middleblocks and then the other end.
The next thing was to plane the middle-blocks to fit the second beam.
I began with the light-through-method:
quite a lot of light ... so nothing to plane off from this block ... now.
After a while I changed to the method of putting carbon-paper between the gluing areas. By rubbing the woodpieces against each other I created black marks where to plane:
... here you can see the marks on the right side and top.
After heaving the beam uncount times I decided that it was enough and glued the whole thing up:
Now wait a while ..