Theres a few sets on ebay. Are they just a straigh swap for the standard fzs600 forks then?
Short answer- no, need the yokes too, and depending on choice of bike you go for May need to grind out the stem and swap it over, possibly welding it in place.
You need to take into account the length of the forks your thinking about fitting.
This is true but there is room to fit longer forks and have them pushed through the yokes, however fork travel then needs to be taken into account with normal forks as mudguard void smash into fairing, with usd's the travel ship Kent be an issue!
With r6 forks you will lose the speedo drive and will need an aftermarket speedo..
Not necessarily, It depends on the wheel casting, I managed to fit the speedo to a thundercat wheel with very minor fettling!
Swapping to a thundercat frontend is very simple, it is better than standard but no where near as good as a proper sports bike front end!