Do you own a GS150?
If you shift its engine to a GSXR chasis, it will only be waste of money. Heavy frame and fairings will result in considerable decrease in power and immense increase in the fuel consumption.
Fairings will not allow proper floe to the engine, and since the GS150 is air cooled, there are great chances that engine might heat up, especially in the hot weather conditions of our country. In summer, even I prefer to ride with the fan on all the time even though my bike is liquid cooled.
The crux of the discussion is, wait for the right time, go for a real sport bike when you can afford it. Keep the GS150 as it is.