The picture works just fine.
Some comments about your crossbow:
1) Either it has been painted (green on black) or it is the first camo Cheetah I have ever seen. I suspect it is painted because there is green on the string.
2) It looks like the last person who used it was left handed because they have fastened the butt-stock release bolt with the handle on the right.
Here is mine (an original Cheetah frame with Quadro 2000 prod (the 'bow'):
Okay, here is what you will have to do to make that crossbow compound:
1) Get a compound prod (obviously). Here is a picture of it:
There was a company in Belgium selling these prods (and indeed selling the wood frame version of the Quadro2000). These are the details of the company (note that they have not responded to my emails but I have not written to them or phoned them recently):
If they still have those, they will probably send you the prod and nothing else. But as you can see from the picture of my crossbow, you need a cable guide rod and a cable hook in order for your frame to support a compound prod. If you look on your frame, up front below where your front sight is, you'll see a hole there. That's where the rod is housed. It is a very strong metal that bends slightly.
Rod dimensions: length: 6" (152mm)
diameter: 0.316" (8mm)
The cable hook can be made from a bit of plastic with a hole slightly bigger than the guide rod and a notch cut in the top. When you have the prod and the cable guide rod, I will post measurements and photos of the cable hook. It doesn't have to be exact, it is a very simple item that you can make by yourself.
After that you just need a better scope and rings. It looks like you have the original scope rings (has screws that tighten to the rail from both sides). Those ones suck, a little bit. You need to get Lynx scope rings (if I recall correctly you want the BRNO 527 rings as the rail on the crossbow is a 16mm dovetail, tapering down to 14mm).
Then find a scope that the crossbow won't destroy. I am on my 5th scope now. The crossbow just thrashes them and the reticles either snap or come loose within the scope. You need to get a high quality air rifle scope (spring rated). The original scope that came with the Quadro kit was a 4x32 multiple reticle Crisscope. It lasted quite long (at least ten years) but after it failed, none of the replacements lasted very long. I got the crossbow when I was 17 and I am now 35. The only other thing I had to replace was one of the grip screws (I over-tightened one and it snapped. I got a replacement from the company named above).
That's it, this is all you need:
1) Prod
2) Cable guide rod
3) Cable hook
4) Better rings
You can make all of them up (non original parts) except for the prod. That you have to buy because it has the proper steel limbs, cams and additional cables. If you change the string serving often and wax it and look after it, you won't need another string on the compound prod. On the recurve (which is what you have there) I had to change strings about three times in the 2 or 3 years I had the crossbow before I upgraded it.
One of the guys at the rifle club has the wood frame version of the Quadro2000 and I will try to get pictures of that for you. It uses an off-centred cable guide and a brass track, but the compound prod is the same, with the same draw weight. You can at least look forward to a 10lb lower draw weight when you upgrade (your recurve should be 150lbs draw weight).
Any more questions, feel free to ask!