OK continuing on...
( I hope everyone can see these pics.)
Here is a pic of all the Aimtrack parts

I didn't like the size of the include usb extension cable.
I went with a 3 meter instead of the default 2.5.

You will notice I had to purchase one of those mini adapter to
plug into the Aimtrack. It came in a pack of assorted mini - usb adapters.
Also I decided against doing any soldering to make troubleshooting easier.

I used terminals blocks ( is that what they call them? )
they come in a strip you can break off what you need.
I did have to do a minor bit of dremeling. I found the Aimtrack would
sit perfectly center in the original lens cavity.
However The lens cavity had to be dremeled square usung the lowest
part of the lens cavity as a base and dremmel the sides square.
I repeated this for both halves of the gun.
I also dremmeled the out edge off the end of barrel as shown.

That bring us to here:

Here is a better breakdown of what hooks where:

I hot glued all the terminal blocks and the part where the usb extension
joins. This made it very stable however the front of board towards the tip
of the gun was not laying flat and trying to stick up.
I used some cutup pieces of pipe insulation to snug the area above
the board and top of gun Cavity.
I used a cut out piece of a CD spindle case for a lens cover It looks
Great and works perfect!

Here is a close up of the lens:

This is the lens installed and the conclusion
of my Aimtrack/Guncon installation!

( I might go back and post some pics of my sensor bar when I'm happy with
the look of it.)
Some pics didn't turn out the greatest. Though working with a webcam
and holding the cam with one hand and snapping the pic with the other
well you get the picture....
Any question feel free to ask.