rap 440 info. needed

[daewoops]

I am building a RAP 440 from parts. I have heard that the astra 75 is a very similar pistol. So far I know that the astra magazines should work in a rap but what other parts are compatible? Also would a 9mm slide assembly from an astra 75 or rap 401 fit and function on a rap 440 frame? If anyone would happen to know a source for parts for a rap 440 it would be greatly appreciated.
Thanks
daewoops