Yes, I know, it was a heap of rusty and greasy junk when I bought it, but the main part, the engine is rock solid and works flawlessly, and the rest of the bike is made of aluminium so it just needed a good sandblasting and fresh paint and I presume that it will be ok for the next 20 years or so when I finish upgrading it :-)
Also, me keeping it in the garden and on the snow and rain didn't help the "presentation" of the project I presume, but now when it is in a warm and dry place, it gets all the lovin it deserves.
Regarding a rear suspension, well, I have few options:
1. replace the original spring with the newer one and ride it that way untill the shock dies ( it is a 2002 shock, so it is not 23 years old )
2. find a newer generation shock somefhere ( the bike was sold untill 2008. ) so the shocks are available still
3. I found some new(ish) shocks for other models, and I can fit a zzr 1100, zxr, zx12 and few other shocks without too much modification on the mounts, and I just need a new lower shock swing which can be easily conected to the swingarm and the frame. I think that I will go this route, because I really want a stiff and responsive rear end, to match the performance of the front forks and balance it all up.
Thank you for the comment and the interest