Building the pyramid frame without welding

[skywatcher]

Step 4:

Mark 39 deg angles at the other ends of the tubes. This will give the upper ends.

[skywatcher]

After cutting, it should look like this:

[islandan]

splendour 

[skywatcher]

Step 5:

Make slots at the lower ends of the tubes, parallel to the cutted edges, approx. 3 mm from the cutted edges, and 3 mm wide.
The width depends on the steel plate you will put into this slot (described in the next step).

For cutting the slots you could use a wire saw with tungsten particles (is used for cutting tiles).

[skywatcher]

Step 6:

Put a piece of steel into the slot, as close to the outer edge of the tube as possible.
(it's better to drill the hole after this) 

Mark the steel at the outside of the tube (on the side which is closer to the edge of the steel tube) and cut it on the marked lines.
Then put it into the slot again, and make the marking for the 4 mm hole which should be 15 mm from the tip of the tube (see picture):