Build a Kicking-Tee From a Cola Plastic Bottle(1,5 L)

I was quite surprised that there were no instructables about building a rugby kicking tee(I suppose this site is frequented mainly by Americans, where Rugby is not so diffused nowadays but exists another "oval-ball sport", and being in english I suppose also by British, Australians, New Zealanders, so potentially quite a massive rugby-passionate audience).
So I decided to fill this gap with my instructable from Italy.

In the pictures:
1) Rugby Player(Gerard Fraser) kicking a penalty.
2-5) Some examples of different brands commercial kicking-tees

The Needed Material:
- 1,5 litre Cola Plastic Bottle
- Pattern( in the pictures)
- A little of isulating tape is needed (more is optional and useful)

Tools:
- Scissors
- Permanent marker pen(fine-small tip is better)
- Shim (1 inch or better 3 cm)

Wash the bottle inside and remove the label.

Trace a vertical line(representing the forward of the tee) with the marker availing the chamfer.
This line is useful as reference.

Trace with the marker a circonference at the right height using the shim.
the tip-point of the marker should be about 3,5cm high from the desk surface, but choosing the shim remember that you must consider the radius of the marker too.

Remove the bottom of the bottle cutting not too close to the traced circle.

Cut following the circle with precision.

Draw the patter (in the picture there are enough informations to draw it)
or print it, but pay attenction that it's in the right scale!!)
on a sheet of paper or something flexible.
DIMENSIONS IN CENTIMETRES!!

OPTION: If you want a taller/smaller version of the kicking tee you can:

A) add/subtract a constant C to the vertical dimensions and draw the pattern with those dimensions
for example add C=2,5cm,
dimensions become: 11,3 - 11,3 - 11,5 - 11,3 - 10,8 - 10,3 - 9,2 - 8,4 - 8,2

B) draw the pattern with the original dimensions and then draw a rectangular shape of the desired height just under the pattern

the result is the same
In both cases I would not exceed 5 cm or 2 inches):

Then cut out following the edges.

Attach the pattern to the bottle using tape
The longer vertical edge of the pattern should be on the vertical reference line.

Convolve the pattern around the bottle, the pattern is half of the bottle circumference

With the marker trace the upper edge shape on the bottle surface.

Remove the upper part of the bottle keeping distance from the traced shape.

The upper part removed

Cut following the line traced

The kicking tee is finished, but I advice you to add some rounds of coloured insulating taper or paint it in some way to avoid lose it because it's quite "invisible".
(I lost the first i made, completely transparent , during a windy and quite dark evening, the wind moved it and I wasn't able to view it on the field)

The tee can hold the ball at different angles; axis from about 85 degrees to about 30 degrees from horizontal.

MODIFICATION: For Other kinds of balls for example American Football the patter would probably need to be modified.