Pointer elevation part, prototipe one

I know it does not look as simple as it could be, but this was the easiest way to build it and still have it accurate to 1 degree. I had to build it to a large scale because of the material available, a smaller scale is possible if you use aluminium square tubing. The platform here is 100mm wide and 200mm long.
The 'needle' on the 'elevation indicator' is just a free swinging wire. I used coper wire that I pulled until it broke to get it perfectly straight, and then inserted so that it is completely free swinging. It is not rocket science, but it is accurate to one degree, and the larger the scale the more acurate it is. Also the free swinging wire elimenates the need to level the tripod platform, wich is not easy with a normal camera tripod. For accuracy I will build one for myself to about twice the size of this one and install it ti a fixed block of concrete that I have in an elevated spot behind my house (perfect place for a private observatory)
I used rivets to asemble, so it is possible to knock out the little steel expander ball and have the whole asembly free of steel, so a compass can be used. However the rivets will not last that long, so for that reason, and for easy dissasembly I would rather use 6 mm steel bolts with winged nuts. This way you will be able to remove one bolt and collapse the whole into a small package for transport.
Back on the issue of scale, it can be built on very small or very large scale without changing the ease of building it.(normally making something small to close tollerances is a challenge)
The fact that the platform moves away from th centre at high elevation helps to view straight up, af course depending on the stability of you tripod.

Comment please.