Hi Alex,
that are indeed a lot of questions.
From your profil I notice that you have a 750R. I don´t know whether somebody has done such modification on the 750 already but I guess it should be possible as well.
In general, nearly all modification are possible. It depends on the level of required modification and finally the cost.
The modification with the lowest impact is to use a ZZR1100C wheel for the rear and a GPZ500S(D) for the front. A 180 tyre will fit using the original swingarm.
Have you checked the documentation already?
http://900r.de/ger/index.html?/umbau...mbautipps.html