In lateral surfaces of plates there are openings under installation of fixture. It is possible to use self-tapping screws on a tree or a nail of suitable length.
That between boards there were no cracks, take a kiyanka, small — centimeters 50-60 — a piece of a board, insert into a groove or a crest (that at you turns out with edge) and on this piece knock a kiyanka, achieving dense occurrence of a board on all plane. Then it is possible to fix.
Under installation of racks of a handrail in an extreme board we do pro-saws (by the sizes of the used bar).
On a reverse side we fasten a Z-shaped design — for rigidity. We take self-tapping screws small length — less, than the total thickness of a table-top and level — that edges did not stick out. For reliability it is possible to miss the mark levels with glue, then to fasten.
If all made correctly, all logs will be horizontal. Also it is necessary to check, that their top edges to a bylivsa in one plane.
We mount racks of a handrail. Them it is necessary to fix to logs, in all width, for this purpose when cutting we add height to the planned height of a handrail a log. We fix nails obliquely, hammering from two parties on three nailing. To hide fastening, in an end face we beat a wide board. It fastens to racks and adjoins not closely. The available gap is blocked by a roundish level (like a plinth).
The last stage we fix a ladder — to a sidewall and a floor.
On this line we fill steps. From each party we twist not less than three self-tapping screws on one step. It is long — too not less triple thickness of a board bowstring. There is the second option of fastening of steps — on corners. Perhaps so to you it will be simpler.
We do a fringing for racks of the same level — joints too nonideal. We saw off four pieces, joining them at an angle 45 °.