Polo dash and seats in mk1

Hi, I have an 1981 gti, currently running an abf engine in it. What is required to fit a polo 6n dash, fitting, wiring, etc. What seats also fit in the rear of the car and the front, which do not require to much modification. It's the earlier type mk1 so it's the ceramic fuse gearbox. I have actually got a polo car, so it's easier to get all the parts.

Thanks.

ive heard the wiring is compliacted not sure though...

i would also like to know this, seems like a very good mod