The top horizontal cross
(3.8 cm x 5.7 cm x 1 m) form a 72 degree angle with the radius.
I set my miter saw at 18 degrees and cut all cross braces and
exterior floor joists.
The 10 upright posts (4.5 cm x 9.5 cm x 1
m) and all
floor joists (4.5 cm x 9.5 cm) rest on the masonry blocks. The
bracing between the 10 upright posts and the perimeter floor
are 3.8 cm x 5.7 cm x 55 cm, with a 45 degree bottom miter and
45 degree x 18 degree compound top miter. The
floor sits on the 10 radial floor joists and the 10
perimeter floor joists (below left). I installed two
additional concentric rings of floor joists, each set 40 cm on
center. The below left and right diagrams show the base structure
floor joist plan and side plan, respectively. The
structure is connected with M8
exterior bolts to 4 pressure treated posts,
anchored in concrete and located around the outer perimeter. If I ever
want to move the structure, it can then be easily
disconnected from the posts.